Airtech Studios Buttstock Extension - G&G ARP9 (GOS-V5 Stock) Pistol Platform_Other These are the "long" models

These are the "long" models

it has an incredibly hard kick thanks to the heavy metal slide and stiffened recoil spring

Operator's Manual can be found here

Multiple ambidextrous sling mounting points

The cuffs have a large strip of good quality hock & loop velcro for easy adjustment

Airtech Studios Buttstock Extension - G&G ARP9 (GOS-V5 Stock) Pistol Platform_Other These are the "long" modelsAirtech Studios BSEU (Butt Stock Extension Unit) for G&G ARP9 is an extender designed to fit the G&G GOS V5 stock. This will fit all GOS V5 stocks. The extension is constructed from thick Polymer attaches directly onto the existing stock as a simple upgrade. This allows you to secure your stock against your shoulder a lot easier.