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£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. 

£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.

£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.

£11.99
  • For AAP-01
  • Ideal Spare
  • Loading Nozzle

A Polymer constructed Gas/Loading Nozzle for the Action Army AAP-01 Assassin Gas Blowback Airsoft Pistol, which is an ideal spare part to own, and is absolutely vital to the function of the Pistol. If you plan on using Full Auto a lot, then a Spare Nozzle is a must-have, as you don't want to be caught out come skirmish day.

£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.

£13.99
  • For AAP-01
  • Ideal Spare
  • Fix Gas Mags

A replacement or spare Outlet / Knocker Valve for the Action Army AAP-01 Assassin 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.

£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.

£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.

£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.

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

A 3D Printed Outer Barrel Assembly for TM & WE branded EU17/EU18 model GBB Pistols, which offers a TDC Grub Screw HOP style adjustment to increase performance when paired with a quality bucking and heavyweight BBs.

£54.99
  • 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.

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