-SR-BUP-ARG is a bullpup conversion kit designed for M4A1 "RIS" GBB
-Gen3 3D printed technology, better durability for airsoft sport
-Including extended barrel
-Optional Maple Leaf short-stroke bolt (FOR GHK GBB M4 SYSTEM ONLY)can solve GBB buffer tube problem for a bullpup kit.
AR Bullpup kit GBB Version
$159.00Price