This is a fully custom m4 with all of the magpul parts you could get at the time of this build (2013ish) has magpul everything. Even when the peq15 was sold through magpul. Has a hard to find g&p magpul receiver set, has a centurion arms rail, etc. This gun was also built inside and out. High speed gears, high torque motor, 6.03 barrel, proven hopup unit, pommy purple bucking and im sure there is more but i don't remember. This gun took me years to build but I got out of the sport and its time to let her go.