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£5.99
  • Made in England
  • Fits most Airsoft AEGs
  • Different strengths available


Springs are the perfect upgrade for an instant FPS boost! They fit in most standard AEGs and have a relatively simple installation process. Many rifles these days have some sort of quick-change spring system which makes your life even easier when upgrading your rifles.

The Bolster Armouries Premium AEG Spring is the best of the best when it comes to internal springs. These are the same springs used in our Bolster Armouries rifles, that's just how premium these springs are! If you want your rifle shooting like a Bolster Armouries ONYX, then the Bolster Armouries Premium AEG Spring is certainly a step in the right direction!

£5.99
  • Made in England
  • Fits most Airsoft AEGs
  • Different strengths available


Springs are the perfect upgrade for an instant FPS boost! They fit in most standard AEGs and have a relatively simple installation process. Many rifles these days have some sort of quick-change spring system which makes your life even easier when upgrading your rifles.

The Bolster Armouries Premium AEG Spring is the best of the best when it comes to internal springs. These are the same springs used in our Bolster Armouries rifles, that's just how premium these springs are! If you want your rifle shooting like a Bolster Armouries ONYX, then the Bolster Armouries Premium AEG Spring is certainly a step in the right direction!

£5.99
  • Made in England
  • Fits most Airsoft AEGs
  • Different strengths available


Springs are the perfect upgrade for an instant FPS boost! They fit in most standard AEGs and have a relatively simple installation process. Many rifles these days have some sort of quick-change spring system which makes your life even easier when upgrading your rifles.

The Bolster Armouries Premium AEG Spring is the best of the best when it comes to internal springs. These are the same springs used in our Bolster Armouries rifles, that's just how premium these springs are! If you want your rifle shooting like a Bolster Armouries ONYX, then the Bolster Armouries Premium AEG Spring is certainly a step in the right direction!

£4.99
  • Rubber construction
  • Replaces the HOP-up unit spring
  • Provides superb air seal

If you're the techy type and want to maximise your AEG's efficiency, the Bolster Armouries HOP-up to Barrel O-Ring Shim Set belongs in your toolbox! This set includes 10 o-rings designed to fit around the HOP-up unit and inner barrel, forcing it back to meet the gearbox as seamlessly as possible to promote maximum efficiency and reduce shot-to-shot FPS deviation.

This set is designed to replace the "one size fits all" HOP-up unit spring, providing a user-customisable solution to account for manufacturing tolerances. While this will take a bit of trial and error to get the perfect fit for your AEG it should prevent airseal qualities from reducing over time and avoid that annoying realisation that you forgot to reinstall the HOP-up spring after upgrading or maintenance!

The Bolster Armouries HOP-up to Barrel O-Ring Shim set should fit almost every AEG on the market and you probably won't need to use the full set, meaning you might even be able to replace two HOP-up springs with a single set.

£29.99
  • 6.02mm Tightbore
  • Stainless steel construction
  • Improve accuracy and FPS

If you are looking for accuracy and FPS upgrades, a tightbore inner barrel is the easiest way to get a bit more from your current setup without adding strain to the gearbox. With this stainless steel tightbore from ZCI installed, you should see a slight FPS increase due to improved air seal, and better accuracy down range thanks to the tighter bore and precise internal finish.

This inner barrel is compatible with standard AEG HOP-up units and is 430mm in length, making it well-suited to 17-inch outer-barrelled AEGs. Its stainless steel construction adds significant rigidity when compared with brass barrels, meaning no amount of rapid fire can cause this barrel to flex, and its finely polished internal surface should guide your BBs onto target with minimal interruption to its flight path.

£79.99
  • 6061 CNC Aluminium
  • Complete Hop-up unit
  • For V2 gearboxes

If you want only the best for your Airsoft AEG, you need this. The MAXX MODEL CNC Aluminium PRO HOP-Up Chamber for M4/AR-15 AEGs is a premium upgrade part, designed to make your AEG shoot with pinpoint accuracy and consistency. CNC aluminium guarantees tight tolerances and superb durability.

The MAXX MODEL Pro unit has a new BB latching system that prevents BBs from dropping out after removing the magazine, no more mess on the floor! The precision rotary adjustment knob allows for extremely precise adjustments, making this HOP a great choice for DMRs as well as standard rifles.

Make your rifle perform to the best of its abilities with the MAXX MODEL CNC Aluminium PRO HOP-Up Chamber for M4/AR-15 AEGs. This premium part will provide unparalleled performance.

£79.99
  • 6061 CNC Aluminium
  • Complete Hop-up unit
  • For V2 gearboxes

If you want only the best for your Airsoft AEG, you need this. The MAXX MODEL CNC Aluminium PRO HOP-Up Chamber for M4/AR-15 AEGs is a premium upgrade part, designed to make your AEG shoot with pinpoint accuracy and consistency. CNC aluminium guarantees tight tolerances and superb durability.

The MAXX MODEL Pro unit has a new BB latching system that prevents BBs from dropping out after removing the magazine, no more mess on the floor! The precision rotary adjustment knob allows for extremely precise adjustments, making this HOP a great choice for DMRs as well as standard rifles.

Make your rifle perform to the best of its abilities with the MAXX MODEL CNC Aluminium PRO HOP-Up Chamber for M4/AR-15 AEGs. This premium part will provide unparalleled performance.

£49.99
  • Programmable MOSFET/ETU
  • For Version 2 gearbox AEGs
  • Burst mode, binary, adjustable pre-cocking

If you want to add programmable fire controls to your AEG without spending too much, the Eshooter Kestrel Basic V2 ETU/MOSFET; Rear wired is a fine choice! The ETU/MOSFET system finding its way into more and more mid to high-end AEGs straight out of the box, the Kestrel Basic offers 6 levels of adjustable pre-cocking, options for 3-round burst and binary trigger, along with low battery warning, cycle completion, active braking and low/high voltage cutoff. All programming is carried out on the fire controls of your AEG, meaning mode changes are easy on the fly and don't require app connectivity.

Compatibility-wise, this version of the Kestrel Basic is designed for rear-wired version 2 gearbox-equipped AEGs, including M4/AR-15, AR-9, SMG-5 (not K or PDW) and G3 AEGs. Installation will require expertise and familiarity with AEG internals, but thankfully, it won't involve soldering as the set comes pre-wired to a Deans battery connector and spade motor connectors. If you're after an affordable MOSFET packed with features which doesn't overcomplicate things, the Kestrel Basic V2 ETU/MOSFET; Rear wired is your best bet!

£104.99
  • 6061 CNC Aluminium
  • Complete Hop-up unit
  • For V2 gearboxes

If you want only the best for your Airsoft AEG, you need this. The MAXX MODEL CNC Aluminium PRO HOP-Up Chamber is a premium upgrade part, designed to make your AEG shoot with pinpoint accuracy and consistency. Thanks to its inclusion of multiple spacers, it is compatible with various Tokyo Marui and VFC-based V2 gearboxes.

The MAXX MODEL Pro unit has a new BB latching system that prevents BBs from dropping out after removing the magazine, no more mess on the floor! The precision rotary adjustment knob allows for extremely precise adjustments, making this HOP a great choice for DMRs as well as standard rifles.

Make your rifle perform to the best of its abilities with the MAXX MODEL CNC Aluminium PRO HOP-Up Chamber for M4/AR-15 AEGs. This premium part will provide unparalleled performance.

£11.99
  • Soft Bucking
  • Grippy Material
  • Air-Tight Design

A soft Hop Rubber for Marui compatible AEGs offering an air-tight design, which comes supplied with a nub and is a purple colour.

£54.99
  • CNC Aluminium & POM construction
  • Various O-rings included
  • Rotary style adjuster - M4/AR15 AEG & HPA compatible

If you are building out your M4/AR15 AEG for maximum performance the Gate EON HOP-up unit is probably already on your list! This precise HOP-up unit is constructed from CNC machined aluminium and is a rotary style unit which applies pressure directly to the top of the HOP-up rubber/nub to minimise side-to-side deviation.

This unit is compatible with M4/AR15 AEGs and can also be used with HPA setups thanks to the included nozzle sleeve which perfectly centres the nozzle for maximum efficiency.

£54.99
  • CNC Aluminium & POM construction
  • Various O-rings included
  • Rotary style adjuster - M4/AR15 AEG & HPA compatible

If you are building out your M4/AR15 AEG for maximum performance the Gate EON HOP-up unit is probably already on your list! This precise HOP-up unit is constructed from CNC machined aluminium and is a rotary style unit which applies pressure directly to the top of the HOP-up rubber/nub to minimise side-to-side deviation.

This unit is compatible with M4/AR15 AEGs and can also be used with HPA setups thanks to the included nozzle sleeve which perfectly centres the nozzle for maximum efficiency.

£29.99
  • Complete V2 Gearbox
  • Fits most M4/AR-15 AEGs
  • SHS Piston & reinforced tappet plate

If your M4 needs a revamp, a new gearbox is the easiest way to do it. The Delta Armory Complete Version 2 Gearbox for M4/AR-15 AEG is compatible with almost every M4/AR-15 AEG on the market and is well-equipped with reinforced parts straight out of the gate.

This is the same gearbox used in the Delta Armory CHARLIE™ line AEGs, boasting a quick change spring guide, 18:1 steel gears running on 8mm bushings, an SHS piston with a full steel tooth rack, an SHS reinforced tappet plate and a reinforced gearbox shell with radiused cylinder window corners.

The pre-installed spring will provide around 380 FPS when installed, so if you plan to use this gearbox for anything other than a semi-auto-locked DMR build you will need an M100, M105 or weaker spring to keep it within site limits. Thankfully, the quick change spring system makes spring swaps a breeze! Whether you are breathing new life into an old M4 AEG or you are building an AEG from scratch, this complete gearbox will save you loads of time and messing around!

£16.99
  • 6.02mm Precision barrel
  • Stainless steel construction
  • AEG Barrel cut - Fits most Airsoft AEGs

If you want to improve your AEGs accuracy, range and consistency, a barrel upgrade is a great start! The Specna Arms 6.02mm Steel Tightbore Inner Barrel promises to be an improvement even over stock 6.03mm brass tightbore barrels and its stainless steel construction makes it far more rigid and less prone to bends than other brass and aluminium barrels.

This barrel is cut for standard Airsoft AEGs and should fit most of them, though we suggest referring to the product description of your gun to find out what length you need. The standard AEG barrel cuts mean you can use this precision barrel with standard AEG HOP-up buckings, HOP-up nubs and HOP-up units, meaning all your existing parts should fit and plenty of opportunities to pair this barrel with other accuracy upgrades. If accuracy is a priority for you this upgraded barrel is a must!

£17.99
  • 6.02mm Precision barrel
  • Stainless steel construction
  • AEG Barrel cut - Fits most Airsoft AEGs

If you want to improve your AEGs accuracy, range and consistency, a barrel upgrade is a great start! The Specna Arms 6.02mm Steel Tightbore Inner Barrel promises to be an improvement even over stock 6.03mm brass tightbore barrels and its stainless steel construction makes it far more rigid and less prone to bends than other brass and aluminium barrels.

This barrel is cut for standard Airsoft AEGs and should fit most of them, though we suggest referring to the product description of your gun to find out what length you need. The standard AEG barrel cuts mean you can use this precision barrel with standard AEG HOP-up buckings, HOP-up nubs and HOP-up units, meaning all your existing parts should fit and plenty of opportunities to pair this barrel with other accuracy upgrades. If accuracy is a priority for you this upgraded barrel is a must!

£18.99
  • 6.02mm Precision barrel
  • Stainless steel construction
  • AEG Barrel cut - Fits most Airsoft AEGs

If you want to improve your AEGs accuracy, range and consistency, a barrel upgrade is a great start! The Specna Arms 6.02mm Steel Tightbore Inner Barrel promises to be an improvement even over stock 6.03mm brass tightbore barrels and its stainless steel construction makes it far more rigid and less prone to bends than other brass and aluminium barrels.

This barrel is cut for standard Airsoft AEGs and should fit most of them, though we suggest referring to the product description of your gun to find out what length you need. The standard AEG barrel cuts mean you can use this precision barrel with standard AEG HOP-up buckings, HOP-up nubs and HOP-up units, meaning all your existing parts should fit and plenty of opportunities to pair this barrel with other accuracy upgrades. If accuracy is a priority for you this upgraded barrel is a must!

£19.99
  • 6.02mm Precision barrel
  • Stainless steel construction
  • AEG Barrel cut - Fits most Airsoft AEGs

If you want to improve your AEGs accuracy, range and consistency, a barrel upgrade is a great start! The Specna Arms 6.02mm Steel Tightbore Inner Barrel promises to be an improvement even over stock 6.03mm brass tightbore barrels and its stainless steel construction makes it far more rigid and less prone to bends than other brass and aluminium barrels.

This barrel is cut for standard Airsoft AEGs and should fit most of them, though we suggest referring to the product description of your gun to find out what length you need. The standard AEG barrel cuts mean you can use this precision barrel with standard AEG HOP-up buckings, HOP-up nubs and HOP-up units, meaning all your existing parts should fit and plenty of opportunities to pair this barrel with other accuracy upgrades. If accuracy is a priority for you this upgraded barrel is a must!

£21.99
  • 6.02mm Precision barrel
  • Stainless steel construction
  • AEG Barrel cut - Fits most Airsoft AEGs

If you want to improve your AEGs accuracy, range and consistency, a barrel upgrade is a great start! The Specna Arms 6.02mm Steel Tightbore Inner Barrel promises to be an improvement even over stock 6.03mm brass tightbore barrels and its stainless steel construction makes it far more rigid and less prone to bends than other brass and aluminium barrels.

This barrel is cut for standard Airsoft AEGs and should fit most of them, though we suggest referring to the product description of your gun to find out what length you need. The standard AEG barrel cuts mean you can use this precision barrel with standard AEG HOP-up buckings, HOP-up nubs and HOP-up units, meaning all your existing parts should fit and plenty of opportunities to pair this barrel with other accuracy upgrades. If accuracy is a priority for you this upgraded barrel is a must!

£25.99
  • 6.02mm Precision barrel
  • Stainless steel construction
  • AEG Barrel cut - Fits most Airsoft AEGs

If you want to improve your AEGs accuracy, range and consistency, a barrel upgrade is a great start! The Specna Arms 6.02mm Steel Tightbore Inner Barrel promises to be an improvement even over stock 6.03mm brass tightbore barrels and its stainless steel construction makes it far more rigid and less prone to bends than other brass and aluminium barrels.

This barrel is cut for standard Airsoft AEGs and should fit most of them, though we suggest referring to the product description of your gun to find out what length you need. The standard AEG barrel cuts mean you can use this precision barrel with standard AEG HOP-up buckings, HOP-up nubs and HOP-up units, meaning all your existing parts should fit and plenty of opportunities to pair this barrel with other accuracy upgrades. If accuracy is a priority for you this upgraded barrel is a must!

£31.99
  • 6.02mm Precision barrel
  • Stainless steel construction
  • AEG Barrel cut - Fits most Airsoft AEGs

If you want to improve your AEGs accuracy, range and consistency, a barrel upgrade is a great start! The Specna Arms 6.02mm Steel Tightbore Inner Barrel promises to be an improvement even over stock 6.03mm brass tightbore barrels and its stainless steel construction makes it far more rigid and less prone to bends than other brass and aluminium barrels.

This barrel is cut for standard Airsoft AEGs and should fit most of them, though we suggest referring to the product description of your gun to find out what length you need. The standard AEG barrel cuts mean you can use this precision barrel with standard AEG HOP-up buckings, HOP-up nubs and HOP-up units, meaning all your existing parts should fit and plenty of opportunities to pair this barrel with other accuracy upgrades. If accuracy is a priority for you this upgraded barrel is a must!

£36.99
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£41.49
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£41.99
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£43.49
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£43.99
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£44.99
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£45.49
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£45.99
  • Stainless Steel
  • 6.03mm Tight Bore
  • Increased Performance

An upgrade Airsoft 6mm BB Gun inner Barrel which is compatible with Airsoft AEG Barrel Compatible Hop-Up units.

£8.99
  • R-HOP Kit - Improves accuracy
  • Includes bucking, HOP arm & nub
  • Ideal for any accurised AEG build

If you're looking for accuracy improvements for your M4/AR-15 AEG, the Delta Armory TRINITY R-Hop Bucking Bundle for AEG is what you need to tighten your groupings. This set includes an enhanced HOP-up arm, HOP-up bucking and OMEGA-style nub manufactured for Delta by upgrade legends Psionic Upgrades. The included HOP-up arm is designed for M4/AR-15 AEG rotary HOP-up units, specifically the Delta Armory/Specna Arms/Evolution/Lancer Tactical type but the bucking and nub are compatible with other Airsoft AEGs of all different shapes and sizes.

The inner patch of the TRINITY bucking is diamond-shaped, similar to the Maple Leaf Super bucking, intended to improve accuracy by applying backspin more consistently. The advantage of using a TRINITY set rather than doing all the mods yourself is its simple drop-in installation, low price compared to sourcing a separate bucking, nub and HOP-up arm and guaranteed compatibility, meaning no chance your nub doesn't work with your chosen bucking. If you're looking for tighter groupings from your Airsoft AEG, the TRINITY R-HOP Bucking Bundle is the one to go for!

£14.99
  • R-HOP Kit for AEGs
  • Includes bucking & nub
  • Extend range & improve accuracy

Whether you're building a DMR or simply want more range from your standard AEG, an R-HOP kit can make all the difference. Unlike other R-HOP kits on the market, the Trusight Tru-Hop Gen.3 is designed to be effectively a drop-in installation, with no need for adding patches of various sizes and includes both the HOP-up bucking and a concave HOP-up nub.

The set is designed to be widely compatible and should fit most Airsoft AEG spec inner barrels, though due to its enlarged contact patch, it will only work with inner barrels with a window measuring approximately 5mm in length x 1.7mm in depth. If you are happy to get stuck in with your AEG internals and you're looking for range and accuracy improvements, the Trusight Tru-Hop Gen.3 Hop-Up Rubber is what you need!

Level up your AEG and get CQB ready

Browse our full spectrum of AEG internal parts, including P90 parts that allow you to upgrade your electric SMG, as well as parts suitable for AEP mods and more.

From steel airsoft motors to electric triggers, we only ever stock named brands we’ve tried and tested ourselves. Plus, if you want to make some changes to your airsoft gun, our expert technical team will be happy to support you - simply get in touch with us and let us know what you need.

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