Airtech Studios Advanced Inner Barrel Locking Ring & Advanced R-HOP Arm - AK47/RK74 Mat Type_Smith & Wesson They fit most M4/M16 variants

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

The EG700 motor offers lasting quality performance

Zippo PL 254B

the backstrap is interchangeable so that the grip can be customized for hands of any size

featuring an 8mm bearing gearbox

Airtech Studios Advanced Inner Barrel Locking Ring & Advanced R-HOP Arm - AK47/RK74 Mat Type_Smith & Wesson They fit most M4/M16 variantsAdvanced 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