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£1.99
  • For GHK G5
  • Very Important Part
  • Stopping Point For Nozzle

A very vital piece of a GHK G5 Gas Blowback Rifle, and is an ideal spare part to own in case the worst should happen come game day.

£1.99
  • 2 x O-Rings
  • Repair Leaks
  • For TAGinn FiST-2

A set of replacement O-Ring/Seals for the FiST-2 CO2/HPA Filling Station, which allows you to fix leaks from your Filling Device and save you having to buy a new unit. If you own a FiST-2 Filling Device, then there's no excuse not to have replacement seals in your inventory to keep you playing should the worst happen on game day.

£3.99
  • CO2 Pistol Use
  • Light Lube Required
  • Spares Replacement Kit

An ideal replacement for any low powered or leaking CO2 pistols and revolvers produced by ASG. 

£3.99
  • Great Spare Part Kit
  • For ASG Duty Series
  • For Pistol & Magazine

A parts kit containing replacement seals/O-Rings for the ASG CZ 75 P-07 and STI Duty gas blowback pistols.

£5.99
  • For 4.5mm / 6mm
  • For Repairing Pistol
  • Great Spare Part Kit

Spare parts kit designed for use with ASG's Raid 400, Thunder 9, and M9-A1 Series of pistols, for both the 4.5mm Airgun and 6mm Airsoft Variants. The set contains four Parts, Two Sizes of Valve Seal, a Valve Ring and Piercer Seal. 

£5.99
  • 70 Degree Hardness
  • For 2012 LM4 GBBR Designs
  • Purpose Designed KSC / KWA

A high quality replacement Hop Up rubber designed specifically for the Airsoft replica LM4 Gas Blowback Rifle. This particular rubber is intended for use specifically in those LM4 GBBRs manufactured to the 2012 design by KSC and KWA MAGPUL.

£6.00
  • For Hadron M-TDC
  • Cure Bad Trajectory
  • Greater Spin Control

This is a nub-plate for the latest generation of Hadron Designs' M-TDC Hop Cover. It has two adjustment points instead of one, offering the user greater control over BB spin.

£6.99
  • For ASG Tac-6
  • For 4.5mm / 6mm
  • Great Spare Part Kit

Spare parts kit designed for use with ASG's TAC-6 Series of rifles, for both the 4.5mm Airgun and 6mm Airsoft Variants. The set contains Six Parts, the Valve Ring, the Valve Seal, Piercer Seal, Thin and Small O-Rings and a Spacer.

£6.99
  • Wide Flat Patch
  • For KSC GBB Style Barrels
  • Variable Degrees Of Hardness

An absolute monster of an upgrade to make to your weapon. The external surface is ribbed to keep your inner barrel more stable inside your hop up unit with next to no play at all after you have fully re-assembled your Airsoft weapon.

£6.99
  • Wide Flat Patch
  • For KSC GBB Style Barrels
  • Variable Degrees Of Hardness

An absolute monster of an upgrade to make to your weapon. The external surface is ribbed to keep your inner barrel more stable inside your hop up unit with next to no play at all after you have fully re-assembled your Airsoft weapon.

£6.99
  • Ideal Spare Part
  • Fix Gas Leak Issues
  • For TM870 / Breacher

A high quality original replacement O-Ring for the TM870 and TM Breacher to help fix gas leak issues where the grip meets the body of the weapon.

£8.99
  • Original Part
  • For WE Hi-Capa
  • Ideal Spare Part

A Polymer constructed Nozzle for the WE Hi-Capa series. 

£11.99
  • High quality Polymer
  • Reinforced Design
  • For TM M4 MWS


A replacement nozzle guide for Tokyo Marui M4 MWS Gas Blowback Airsoft rifles. This nozzle set can be used to strengthen the replica as a more durable upgrade than the existing part. If you're looking to use the MWS at higher than standard FPS then this could be a great upgrade part to handle the increased pressures of more powerful gas.

£12.00
  • 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. 

£12.99
  • Aluminium
  • For Army/Marui
  • Improved Compression

An enhanced HOP Unit for Army Armament / Tokyo Marui branded M1911 platform Gas Blowback Replicas, which serves to improve compression and lift achieved from your BBs. It is constructed from Aluminium and comes supplied with the Chamber, HOP Army, Adjustment Wheel, Two Screws and a small O-Ring.

£15.99
  • For Tag Shells
  • Repair Full Grenade
  • O-Rings/Valve/Bearing

A handy seal/repair kit which contains Bearings, O-Rings and an Inlet Valve, and can help repair a faulty TAGinn Shell Launcher such as the Shell, Shell-PRO, Shell-VOG and Shell Multi-R.

£17.25
  • 20mm Rail
  • HOP Modification
  • Twin Screw Adjustment

An updated design of the Top Dead Centre HOP Modification for MK23 NBB Pistols, from Hadron Designs. This awesome bit of kit provides fine Twin Screw control over your HOP adjustment for precision tuning, as well as a top 20mm rail to install sights.

£17.99
  • CNC Machined
  • Improved RIF Reliability
  • Increased Gas Efficiency

A high quality Rocket Valve for KSC branded M4/G-Series/USPs manufactured by Angel Custom out of CNC Stainless Steel. The benefits of an uprated Rocket Valve are increased and more stable FPS thanks to more precise engineering and denser materials.

£18.99
  • Military Grade Polymer
  • Upgrade Hop Unit
  • Highly Durable

A military grade polymer replacement for the stock Toyko Marui Airsoft MWS Gas Blowback Rifle hop-up unit designed and built by Angry Gun. This high quality part is an upgrade from the stock one and is perfect for those who are further wanting to upgrade the performance of their replica, or for those who have broken their existing part and are looking to upgrade.

£19.99
  • Easy to Install
  • OEM Replacement
  • Good Spare to Own

A complete kit to resolve 99% of gas inefficiency and leaking problems throughout your pistol. 

£24.99
  • Holds position securely
  • CNC Machined Parts
  • For High End Builds


A CNC Machined replacement for the stock Toyko Marui Airsoft MWS Gas Blowback Rifle hop-up adjuster designed and built by Angry Gun. This high quality part is an upgrade from the stock one, allowing for finer adjustment and holds its position better. This part is perfect for those who are further wanting to upgrade the performance of their replica, or for those who have broken their existing part and are looking to upgrade.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£26.99
  • GBB Barrel
  • Stainless Steel
  • Rigid & Accurate

A Precision Inner Barrel for Gas Blowback Pistols and compact Airsoft weapons, produced to an incredibly high standard of tightbore performance increasing your range and accuracy over distance.

£27.50
  • 3D Printed
  • 0.4g+ Required
  • Lightweight & Tough

A 3D Printed Outer Barrel Assembly for TM & WE branded G17/G18 model GBB Pistols, which offers a TDC Grub Screw HOP style adjustment to increase performance when paired with a quality bucking and heavyweight BBs.

More Bang and less Hiss...

Upgrades and replacement parts for the inside of your Gas Blowback Airsoft Weapons. Here at Patrol Base Airsoft we stock a wide range of OEM Manufacturer Replacement Parts, as well as various Aftermarket Upgrade Parts designed to enhance the performance of your Airsoft Gun.

We stock a range of Parts and Upgrades for Gas Pistols, Rifles, and Submachine Guns allowing you to tweak your weapon to perfection. Our parts allow you to increase your Accuracy, improve the Recoil of your weapon, and make them more Gas Efficient.

We have Internal Parts available from all the best manafactuerers, such as Tokyo Marui, ASG Action Sport Games, WE Europe, Nuprol, King Amrs, LCT and more, following our golden rule, if we wouldn't use it, we won't sell it!

If you can't find something that you like, or want something which isn't on the website why not contact us via Phone and we can do our best to source it for you!
Telephone: 01484 644709