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£6.99
  • Aluminium construction
  • Replacement original parts set
  • For Army Armament Hi-Capa GBB series

If you have hammer issues with your Army Armament Hi-Capa, this should help! The Hammer and Strut for Hi-Capa GBB Pistols from Army Armament is constructed from Aluminium and an original replacement part for the Army Armament Hi-Capa GBB series, including the R501, R504, R603, R608, R609 and potentially others. The set includes both the hammer and hammer strut and should be compatible with most TM clone Hi-Capa pistols, though it may need mods for anything other than Army Armament 'Capas. 

£14.99
  • 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!

£12.99
  • Polymer construction
  • Complete nozzle set
  • For Action Army AAP-01 Assassin GBB Pistol

If you want your AAP-01 GBB to be running at its absolute best an enhanced nozzle would be a great choice to get the most out of this impressive platform. The CowCow Enhanced Plastic Nozzle Set includes an enhanced nozzle, nozzle valve, valve lock pin, valve spring and enhanced piston head, and when installed these parts should improve the shot to shot consistency, provide smoother cycling performance and improve the rate of fire of the AAP-01 Airsoft GBB.

£9.99
  • Replacement Sear spring
  • Revised contact surfaces to reduce friction
  • For TM based Hi-capa/1911 GBB pistols

The CowCow Trident Sear spring is designed to replace your original sear spring, and features revised contact surfaces which have been narrowed to prevent excessive friction with other parts. If you are building a high speed Hi-capa or 1911, this is perfect for the job!

£19.99
  • Replacement hammer
  • Alloy construction
  • Stainless Steel finish

An upgraded hammer is a great foundation to any upgraded AAP-01 build, especially if you are an HPA user! The CowCow SS Hammer is CNC machined from strengthened alloy with a stainless steel finish, and MAF polishing technology is applied to its exterior surfaces to reduce friction between parts and ensure smooth operation of the pistol.

£7.99
  • CNC 6061 Aluminium construction
  • Heat gradation finish
  • Short stroke your AAP-01 for more speed

Is your AAP-01 not fast enough? The CowCow Aluminium Buffer for AAP-01 is designed to satisfy even the most ravenous appetite for speed! This set includes two recoil rod spacers which are CNC machined from 6061 aluminium to provide a great balance between strength, precision and low weight. Adding one or two of the spacers to your guide rod will reduce the length of travel of the AAP-01 bolt and speed up the already impressive cyclic rate of the AAP-01 in both semi-auto and fully automatic fire.

£9.99
  • Recoil buffer kit
  • Various spacers included
  • Speed up your Hi-capa or 1911!

The Competition Recoil Buffer Module from CowCow is designed to shorten the travel of the slide of your pistol, increasing its cyclic rate. The set includes 8 recoil buffer pads of varying hardness which can be stacked in various combinations to fine tune your pistol for optimum speed.

£19.99
Was £34.99
Save £15.00
  • 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.

£13.99
  • Reinforced fire pin lock
  • Stainless steel construction
  • For TM/WE EU series, AAP-01 and Umarex/VFC Glock

If you are looking for reliable long term performance from your EU series GBB pistol, AAP-01 Assassin or Umarex/VFC pattern Glock GBB pistol, CowCow are here to provide! This replacement fire pin lock is constructed from stainless steel using precise CNC machining and is polished using MAF polishing technology for smoother function with less friction. The stainless steel construction of this part prevents warping under heavy use, and guarantees reliable long term performance, assuming the rest of your pistol is working fine!

£4.99
  • Spring steel construction
  • Enhanced recoil spring
  • For Action Army AAP-01 GBB pistol

If you are after an improvement in recoil force and cyclic rate from your Airsoft AAP-01 GBB pistol, an uprated recoil spring is a great way to get there! The 150% Recoil Spring from CowCow provides an increase in strength over the original recoil spring installed into the AAP-01 and should improve the rate of fire and provide a snappier bolt speed with a slight increase in recoil.

£5.99
  • Enhanced recoil spring
  • Speed up your cyclic rate
  • For TM Hi-capa and clones

So you have yourself a snappy pistol, but you want MORE speed? If you say so! The RS1 recoil spring from CowCow replaces your original recoil spring and will increase the speed at which your slide returns to battery, increasing the cyclic rate. Perfect for those who need that extra bit of speed!

£8.95
  • For 0.4g BBs +
  • Silicon Construction
  • For VSR-10 / KJW / WE

A high quality replacement Hop up rubber, made to 70 degrees of hardness, and designed for VSRs, as well as KJW and WE Airsoft designs.

£22.99
Was £24.99
Save £2.00
  • Aluminium construction
  • For Tokyo Marui EU series & AAP-01 GBB pistols
  • Each trigger comes with 3 trigger safeties in different colours

If you want to add a touch of style to your plain jane EU series or AAP-01 GBB pistol, the CowCow Tactical Trigger is a great way to set your pistol out from the crowd. This trigger is available in three colour options; matt black for a more tactical look, silver for a touch of class, or gold for those after a "loud and proud" look. 

Each colour option includes even more options when it comes to the trigger safety extension, as each set comes with a red, gold and black extension piece to choose from. This trigger is a partially flat design for additional speed but also includes a finger ledge to prevent your spritely trigger finger from slipping off. This trigger is designed for the Tokyo Marui EU series of GBB pistols and is also compatible with the Action Army AAP-01 and AAP-01C, but may also fit some other EU pistols based on the TM design.

£22.99
Was £24.99
Save £2.00
  • Aluminium construction
  • For Tokyo Marui EU series & AAP-01 GBB pistols
  • Each trigger comes with 3 trigger safeties in different colours

If you want to add a touch of style to your plain jane EU series or AAP-01 GBB pistol, the CowCow Tactical Trigger is a great way to set your pistol out from the crowd. This trigger is available in three colour options; matt black for a more tactical look, silver for a touch of class, or gold for those after a "loud and proud" look. 

Each colour option includes even more options when it comes to the trigger safety extension, as each set comes with a red, gold and black extension piece to choose from. This trigger is a partially flat design for additional speed but also includes a finger ledge to prevent your spritely trigger finger from slipping off. This trigger is designed for the Tokyo Marui EU series of GBB pistols and is also compatible with the Action Army AAP-01 and AAP-01C, but may also fit some other EU pistols based on the TM design.

£2.99
  • Spring steel construction
  • Enhanced nozzle spring
  • For Action Army AAP-01 GBB pistol

If you are after an improvement in FPS and recoil force from your Airsoft AAP-01 GBB pistol, an uprated nozzle spring is a great way to get there! The 200% Nozzle Spring from CowCow provides double the strength of the original nozzle spring installed into the AAP-01 and should improve FPS and provide a snappier cyclic rate with a slight increase in recoil.

£9.99
  • CNC Aluminium construction
  • Replacement part for the Action Army AAP-01
  • Precise engagement and improved strength

If you are building out your AAP-01 to push its performance up to new levels, make sure you toughen it up for the long term while you are at it! With that in mind, the AAP-01 Selector Plate from CowCow Technologies provides a replacement for the original selector plate which is far stronger than the original alloy piece and is precisely machined from aluminium using CNC technology for precise engagement for a lifetime of heavy use. 

£4.99
  • Baseplate seal
  • Reduces Leaking
  • Improves Gas Seal

A silicone rubber seal designed to fit on the bottom of your Hi Capa magazine internally, to replace old and work out seals and reduce leaks. With a properly fit and lubricated seal you should never experience a leak again, just ensure you coat the seal in silicone based lubricant prior to fitting it, and be gentle! These things may snap under too much tension.

£59.99
  • For WE / TM / VFC
  • 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 WE,  Tokyo Marui, or VFC EU-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.

£3.99
Was £5.99
Save £2.00
  • Replacement magazine fill valve
  • For GBB magazines
  • Includes an O-ring

If you have a magazine which leaks from the fill valve, or your mag is a bit old and the valve has taken a hammering over the years, a replacement valve is the way to go. This Specna Arms valve replaces the fill valve in your magazine with a nice fresh one, complete with an O-ring to ensure there are no leaks! This valve will require a valve key to install.

£7.99
  • 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.

£34.99
  • CNC machined aluminium
  • Available in several colours
  • For TM Hi-capa GBB and clones

Upgrade your GBB Hi-Capa and facilitate insane cycling speed with the EDGE Ultra Light Aluminium Blowback Housing. Perfect for either competition shooting or for you speedsofters out there, this blowback housing is incredibly light, weighing approximately 17g, complete with its piston and O-ring.

£34.99
  • CNC machined aluminium
  • Available in several colours
  • For TM Hi-capa GBB and clones

Upgrade your GBB Hi-Capa and facilitate insane cycling speed with the EDGE Ultra Light Aluminium Blowback Housing. Perfect for either competition shooting or for you speedsofters out there, this blowback housing is incredibly light, weighing approximately 17g, complete with its piston and O-ring.

£4.99
  • 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. 

£7.99
  • 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.

£9.99
  • Polymer construction
  • Enhanced nozzle for improved air seal
  • For Action Army AAP-01 Assassin GBB pistol

If you want your AAP-01 GBB to be running at its absolute best an enhanced nozzle would be a great choice to get the most out of this impressive platform. The CowCow Enhanced Plastic Nozzle is designed to improve the air seal performance and gas efficiency of the AAP-01, the result of which should be an increase in rate of fire and cyclic speed, with less wasted gas per shot. The set includes an enhanced loading nozzle for the AAP-01 GBB and the nozzle valve lock pin.

£8.99
  • Replacement O-ring set
  • For Airsoft gas magazines
  • Fix up your old leaky mags!

If you have a pile of leaky mags, now is the time to fix them up! The WADSN Gas Magazine O-ring Repair Set includes 10 O-rings of 7 different sizes, designed to replace the O-rings of the knocker valve and fill valve in most Airsoft gas magazines. The set is supplied in a clear polymer organiser case to keep everything neat and includes a set of polymer installation tweezers to make installation without damaging the O-rings considerably easier. If you have a lot of leaky mags gathering dust, this set is the key to giving them a new lease of life!

£34.99
  • CNC Aluminium Construction
  • Includes Blowback housing, piston, and O-rings
  • For TM based Hi-capa GBB pistols

If you have been researching parts for your latest Hi-capa build you will doubtless have heard of CowCow, a relatively recent arrival on the Airsoft scene, with a growing reputation for producing high quality, precision parts for TM based GBB pistols. The Dynamic Blowback Housing Unit for the TM Hi-capa and its clones includes a CNC machined 7075 aluminium housing which is available in either silver or black anodized finish, 3 rubber O-rings, and a CNC machined piston assembly, anodized in red.

£2.99
  • Polymer construction
  • Replacement original part
  • Compatible with Army Armament 1911 GBB series

If you have an Army Armament 1911 GBB with a broken nozzle you are in luck! The Army Armament Nozzle for 1911 GBB Pistol is a replacement original part designed for the Army Armament 1911 GBB series, including the R26, R28, R31 and R32 pistols. This nozzle may also work with TM-compatible 1911 pistols from other brands, but as always we only recommend brand mixing for the experts as this may require fine-tuning and modification.

£6.00
  • For RAVEN EU18
  • OEM Replacement
  • Fix Hammer Issues

A replacement Hammer and Spring for the RAVEN EU18 automatic gas-powered pistol.

£7.99
  • 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.

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.