Airtech Studios Advanced Inner Barrel Locking Ring & Advanced R-HOP Arm - AK47/RK74 Mat Type_Smith & Wesson The pistol is made mostly

The pistol is made mostly from high quality heavyweight ABS plastic

Zippo PL 254B

featuring an 8mm bearing gearbox

In SEMI Mode

They fit most M4/M16 variants as well as G&G's GR15/GR16 series of AEGs

Airtech Studios Advanced Inner Barrel Locking Ring & Advanced R-HOP Arm - AK47/RK74 Mat Type_Smith & Wesson The pistol is made mostlyAdvanced Inner Barrel Locking Ring The Advanced locking ring is designed to replace the current O ring (Normally brass) ring at the end of setting up the hop unit, however, with the original, there is a tendency for a wobbly gap in between the components which would tilt the barrel at an angle. Once the new O ring is installed, it will ensure a snug fit to restrict the motion of the barrel that is inside the hop up chamber. It will secure the inner