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4.99
  • Stop magazine leaks!
  • Rubber O-Rings
  • Great spare parts

This is a set of spare O-rings for Novritsch SP1, SSP2 & SSP5 V2 magazines. They are the perfect replacement parts for magazines that are leaking gas. Become a maintenance master and fix your leaky mags, rather than spending extra on new ones. Should your magazine spring a leak, a spare set of O-Rings is always handy. 

Fix your Novritsch magazines so they're skirmish-ready, or have some spare parts should the worst scenario occur. The Novritsch SSP2 O-Ring Set gives your magazines a second chance at fighting!

14.49
  • Maximum Range HOP-up rubber
  • 50-Degree hardness - Ideal for 280-360 FPS
  • Compatible with TM based GBB & VSR platforms

The Maple Leaf MR HOP-up Bucking is widely regarded as the best HOP-up bucking offered by Maple Leaf, offering a wider and longer “R-HOP” style contact patch for increased HOP-up effect and extended range with heavy BBs. The MR HOP also uses a shield-shaped groove around the contact patch to allow it to stretch and add to the strong HOP-up effect and an air seal improving C-ring which ensures the bucking is firmly fitted to the barrel and unable to slip or rotate.

MR stands for “Maximum Range”, a design intended to prioritise range over grouping size and the ideal pairing for the Maple Leaf I-Key. This bucking is compatible with Tokyo Marui-based GBB and VSR platforms, WE and VFC GBBRs and as always, we only recommend upgrade parts for those who are confident working on their platform's internals. If you want to extend your range out to the borderline implausible, the Maple Leaf MR.HOP HOP-up Bucking will do the trick!

23.99
Was 41.49
Save 17.50
  • Skeletonised hammer with hexagonal design
  • Compatible with Tokyo Marui Hi-capa and clones
  • Available in silver, black, or heat gradation finish


If you are planning a Hi-capa overhaul the Custom Hammer from Laylax Nine Ball is a great choice to not only improve the feel of your trigger but add some style points too. This hammer is a skeletonised design with weight-reducing ports machined into the hammer in a hexagonal shape, giving the hammer an ultra-modern look. The hammer is constructed from aluminium, keeping the weight low for maximum performance whilst boasting added strength when compared to most alloy hammers provided out of the box.

23.99
Was 41.49
Save 17.50
  • Skeletonised hammer with hexagonal design
  • Compatible with Tokyo Marui Hi-capa and clones
  • Available in silver, black, or heat gradation finish


If you are planning a Hi-capa overhaul the Custom Hammer from Laylax Nine Ball is a great choice to not only improve the feel of your trigger but add some style points too. This hammer is a skeletonised design with weight-reducing ports machined into the hammer in a hexagonal shape, giving the hammer an ultra-modern look. The hammer is constructed from aluminium, keeping the weight low for maximum performance whilst boasting added strength when compared to most alloy hammers provided out of the box.

8.49
  • Polymer construction
  • Replacement Hi-capa feed lips
  • Fix up your old magazines 

If you have dropped a mag mid game you probably have a set of broken feed lips, but fear not! The Army Armament Magazine Feed Lips for Hi-capa GBB is designed to replace the original feed lips of AA Hi-capa magazines whether they are cracked from an accidental drop or just getting a bit worn out. 

3.99
  • 140% Hammer spring
  • Improves recoil and slide speed
  • For Tokyo Marui EU series GBB Pistol

Looking for more recoil from your EU series GBB pistol? Installing a stronger hammer spring should do the trick! This 140% Hammer Spring from CowCow replaces the original hammer spring in your Tokyo Marui based EU series pistol and provides additional force for each hammer strike, releasing more gas and providing higher FPS and improved recoil and slide speed! This part is constructed from high strength spring steel and is hard-coated to prevent corrosion.

76.99
  • For TM / KJ Works
  • Pre-Built Hop-Up
  • Drop in kit

A pre-built drop in hop-up unit and barrel set up built by Maple Leaf with their best parts already included in it. The kit can be dropped into any Tokyo Marui / KJ Works M1911 / MEU Series gas blowback Airsoft pistol for instant results. The set includes an alloy Hop-Up unit, 60 Degree hop-up rubber and Crazy Jet Inner barrel for high performance and improved accuracy. This is perfect for those who are looking to upgrade their pistol with minimum effort.

88.99
  • 70° HOP Bucking
  • For Hi-Capa Pistols
  • 6.02mm Inner Barrel

An aftermarket upgrade/replacement Inner Barrel and HOP Unit/Rubber for Hi-Capa Series Airsoft Pistols, specifically the Army Armament R601. This awesome package provides you with a Precision 6.02mm Inner Barrel, as well as a HOP Chamber, ML 70° Bucking and 'I-Key Delayer', to improve range, accuracy and precision.

The installation of this unit is relatively straightforward, and will be compatible with beginner/experienced techs.

9.49
  • PTS MEC Enhanced internal series
  • 2x Enhanced HOP rubbers/buckings
  • Two contact surfaces for improved consistency

The MEC HOP rubber/bucking is precision moulded and has a slightly narrower inner diameter at the entrance and extra coverage for the top of the barrel cut area for a vastly improved air seal. This HOP rubber provides two points of contact with the bb with equal pressure on either side, improving effective range and consistency.

5.99
Was 9.49
Save 3.50
  • Stainless steel construction
  • Titanium coated
  • For Tokyo Marui Hi-capa and 1911 GBB pistols

If you are building out your dream Airsoft Hi-capa GBB pistol, the CowCow Stainless Steel hammer strut would be a great addition if you require an improved trigger feel and better mechanical engagement. This part is constructed from stainless steel with a titanium coating to prevent corrosion and warping. When installed into your TM based Hi-capa or 1911 GBB this part should help improve shot to shot consistency and provide longevity far beyond the original parts.

5.99
Was 9.49
Save 3.50
  • Stainless steel construction
  • Titanium coated
  • For Tokyo Marui Hi-capa and 1911 GBB pistols

If you are building out your dream Airsoft Hi-capa GBB pistol, the CowCow Stainless Steel hammer strut would be a great addition if you require an improved trigger feel and better mechanical engagement. This part is constructed from stainless steel with a titanium coating to prevent corrosion and warping. When installed into your TM based Hi-capa or 1911 GBB this part should help improve shot to shot consistency and provide longevity far beyond the original parts.

14.49
  • 2x Power Options
  • 6026 T9 Aluminium
  • CNC Machined Precision

Precision CNC machined from high quality T9 aluminium, this set of two power down valves allows users of certain gas powered KSC/KWA branded Airsoft guns to reduce their output FPS to a more game-safe level. 

7.49
  • Steel construction
  • Trigger actuator
  • For GBB pistols

An upgrade or replacement stock sear spring for gas blowback pistols. The spring is made of robust steel and therefore will hold its shape better than stock springs, which is perfect for keeping your trigger action to be short and crisp. Due to the springs high tolerance, there would be no need to shave it down to fit in your grip.

29.99
  • Upgraded HOP-up chamber set
  • Alloy construction w/steel HOP-up arm & alu tensioner
  • Compatible with most EU-series GBB pistols

If you want your sidearm to be capable of really reaching out, a HOP-up upgrade should be top of your list! The Maple Leaf HOP-up Chamber for VFC/WE/TM EU-Series GBB is constructed from alloy and supplied with a steel HOP-up arm and aluminium "I-key" style tensioner, promising tighter tolerances than the stock HOP-up unit which should translate to better air seal qualities, consistency and thus better accuracy downrange.

This set is compatible with VFC, WE and Tokyo Marui EU-series GBB pistols but should also fit most Tokyo Marui clone EU-series pistols, though as always, we recommend upgrade parts only for the knowledgeable and confident!

9.49
  • Replacement original part
  • For Novritsch SSP1 & SSP5
  • VSR/GBB Spec HOP-up rubber

Whether your HOP-up rubber is worn out or you are seeking an upgrade, the Novritsch HOP-up Bucking for SSP1/SSP5 GBB pistol is one to keep an eye on. This HOP-up bucking is a big reason that Novritsch pistols have such incredible range, and being a VSR/GBB style HOP-up rubber, this should be compatible with most TM-based GBB pistol designs as well as the VSR-10 sniper rifle series.

9.49
  • Silicone construction
  • Various "hardnesses" available
  • Wide "flat HOP" contact patch

The Maple Leaf Autobot HOP-up rubber has gained a reputation as one of the best upgrade components if you want to extend the range and improve the accuracy of a TM based GBB pistol, VSR/bar-10 sniper rifle, or GBBR with TM GBB HOP-up bucking compatibility. The Autobot has a wide and flat contact patch to help stabilise your BB in flight and extend your range. This bucking is also designed to ensure your BB is chambered consistently with every shot, guaranteeing impressive accuracy when compared to standard HOP-up buckings. This is the latest variant of the Autobot and is constructed from silicone instead of standard rubber, offering greater resistance to temperature changes.

7.49
Was 10.99
Save 3.50
  • Replacement part
  • Brass with rubber O-rings and a steel knocker
  • Fix up your old MK.23 magazines!

A replacement or spare Outlet / Knocker Valve for the Tokyo Marui MK23 SOCOM NBB Pistol. If you own plenty of Magazines and want to keep them in tip-top condition, then you're going to want a few Knocker Valves spare in your arsenal. They are incredibly easy to install, provided you have an appropriate Valve Key on standby. You can use other tools to install them, but this is not recommended as you could damage the Valve.

8.49
  • Full O-ring set
  • Replacement for original parts
  • Repair or refresh your Gas shotty!

If you have a leaky M887x series shotgun this is what you will need to fix it. Replacement complete O-ring set, useful to repair your old unloved Shotgun or refresh your well loved Shotgun.

4.99
  • Steel construction
  • Spring with safety & slide stop plunger
  • Original Army Armament replacement part

If you are fixing up your Hi-capa or 1911 you might need one of these! The Slide Stop/Safety Spring and Plunger includes the dual purpose slide stop/safety spring and the plunger for each, making it the perfect replacement set for those who have lost or damaged these parts. All components in this set are constructed from steel, and are designed to fit the Army Armament 1911 and Hi-capa GBB pistols but may fit others based on the Tokyo Marui internal design. 

14.49
  • Brass construction
  • Replacement knocker valve
  • For Tokyo Marui EU17 GBB

The MEC M-Valve from PTS is designed to improve gas efficiency and speed up the cyclic rate of your Tokyo Marui EU17 GBB pistol. The valve is constructed from high strength brass with rubber O-rings and should help improve the performance of your pistol in cold weather, and speed up the cyclic rate if you have installed a heavy steel slide.

14.49
  • Brass construction
  • Replacement knocker valve
  • For KSC/KWA GBB pistols and SMGs

The MEC M-Valve from PTS is designed to improve gas efficiency and speed up the cyclic rate of your KWA/KSC GBB pistol or SMG. The valve is constructed from high strength brass with rubber O-rings and should help improve the performance of your pistol in cold weather, and speed up the cyclic rate if you have installed a heavy steel slide or bolt.

9.49
  • Gas route bucking set
  • Set of 5  - 70 Degrees hardness rubber
  • For CYMA CGS, Double Eagle & TM ZET system M4 GBBR mags

If you've got leaky M4 ZET system mags, these could help fix them up! The CYMA CGS Enhanced M4 ZET System Gas Route Bucking 70 Degrees - Set includes 5 gas route buckings/seals for TM ZET system M4 GBBR magazines constructed from 70-degree hardness rubber for temperature resistance and improvements in strength. 

Not only a handy spare to have on hand for anyone with TM ZET system M4 magazines, these gas route buckings can also help improve gas efficiency by reducing gas leakage between the magazine and nozzle, especially if you've installed a CGS nozzle or bolt carrier group into your TM. The CGS Enhanced M4 ZET System Gas Route Bucking is compatible with Tokyo Marui and CYMA CGS M4 magazines and should also fit the Double Eagle M4 ZET system magazines. 

2.49
  • Spring steel construction
  • Replacement original part
  • For KJ Works B9/B92 GBB Pistols

If your KJ Works B9/92 has trigger issues, this might be the key to getting it running again. The KJ Works Trigger Spring for B9/92 GBB Pistol is a replacement original part for the KJ Works B9 and B92 GBB pistol series and is constructed from spring steel. This is the spring that resets the trigger, so if your trigger gets stuck back after one shot this might solve your issue!

14.49
  • Replacement original part
  • Beavertail grip safety for 1911 GBB pistols
  • Compatible with most TM clone 1911 GBB pistols

If your grip safety is worn out, this replacement should cure that! The KJ Works Grip Safety for 1911 GBB Pistols is a replacement original part for the KJ Works 1911 GBB pistol series but should also fit most Tokyo Marui and TM clone 1911 GBB pistols. The grip safety is constructed from alloy and finished in black. Please note, this part may require modification to install and as such we recommend it only to experienced Airsofters with a decent amount of tech knowledge.

35.49
  • Set of 5 feed lips & gas route buckings
  • Ideal spares for ZET system M4 GBBR users
  • Fits TM M4 MWS, CYMA CGS M4 & Double Eagle GBBR mags

The CYMA CGS Feed Lips & Gas Route Bucking Set for ZET System M4 GBBR provides 5 sets of feed lips and 5 gas route buckings for your magazines, allowing you to fix up old mags or keep spares handy just in case. This set is designed for TM ZET system M4 GBBR mags and should also fit clones of the TM design, including CYMA CGS M4 GBBR mags and Double Eagle M4 GBBR mags. 

The included feed lips are an ideal spare part to have on hand; as any experienced GBBR user will know, dropping a hefty gas mag is likely to break the lips and render the magazine useless. The Gas Route Buckings are also very useful in the event your magazine develops a leak from the top, and can also help improve gas efficiency should you decide to upgrade your TM or Double Eagle M4 GBBR with a steel CGS bolt carrier group. If you're getting in deep with ZET system GBBRs, this set belongs in your toolbox!

14.49
Was 23.99
Save 9.50
  • For TM MK23 and ASG MK23
  • Alloy construction with steel spring
  • Hammer, spring and knocker set

If your MK23 is getting a bit worn out, we have the cure right here! Introducing the Tokyo Marui MK23 Hammer set, a set comprising of an alloy hammer, alloy valve knocker, and steel hammer spring. These parts are a drop-in replacement for your original MK23 components, and will not require any modification. Treat your SOCOM to some fresh parts for more *thud thud* "HIT!" action!

14.49
  • High density polymer construction
  • Replacement original part
  • For Novritsch SSP2 GBB Pistols

If you love your SSP2 and would hate to see it out of action, grab the Novritsch Nozzle Set for SSP2 GBB and keep it in the parts stash just in case! This nozzle is a replacement original part designed for the SSP2 Hi-Capa GBB pistol from Novritsch and is constructed from high density polymer. Nozzles are a known failure point for GBB pistols and as reliable as the SSP2 is, it's always wise to have spare parts so you can keep your beast of a 'Capa up and running!

15.49
  • Polymer construction
  • For SSP18 GBB Pistol
  • Keep one in the toolbox just in case!

If you love your SSP18 and want to keep it shooting in the long term, having a Novritsch SSP18 Complete Nozzle can't hurt! This polymer loading nozzle is compatible with Novritsch SSP18 GBB pistols and is a fantastic part to have lying around to pre-empt potential disaster, especially if you use full auto a lot. If you're very attached to your SSP18 and don't ever want it to sit around awaiting spare parts, grab this to put your mind at ease!

82.99
  • Replacement grip safety
  • For TM Hi-capa GBB and clones
  • Steel construction

As far as Hi-capa parts go, Airsoft Masterpiece are currently producing some of the best the Airsoft world has ever seen! The Steel Grip safety Type 2 replaces your original beavertail grip safety with a precisely machined steel part, guaranteed to perform when you need it!

53.49
  • Replacement hammer set
  • Stainless steel finish
  • For AAP-01 Assassin GBB

If you are working on your dream AAP-01 build you will want it to be performing to its maximum until the end of time. An upgraded hammer is a great way to improve your AAP-01's longevity and its resistance to wear. The CowCow SS Hammer Set is constructed from CNC machined alloy with a stainless steel finish and is highly polished for smooth operation with minimal friction.

About Our All Gas Blowback Parts

Stock up on vital accessories and upgrade your weapon ahead of a skirmish with our range of gas blowback parts. From feed lips to HOP Rubbers, O-Rings, hammers, complete spares kits and many more, you’ll find it all at Patrol Base.

Ideal for a range of airsoft gun designs, our airsoft gas gun parts are compatible with green gas pistols and CO2 pistols alike, as well as our gas shotguns and beyond. 

Don’t stop there; explore our entire collection of airsoft upgrades and create your dream personalised airsoft replica, from electric internal parts to  inner barrel accessories and AEG springs.

Our airsoft experts are also on hand to provide support with your technical modifications, simply get in touch with our team today.