PRE-ORDER ETA: JUNE, 30, 2023
-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 can solve GBB buffer tube problem for a bullpup kit.
-early bird pre-order discount= 15% off,  coupon code: BUPARG15