G&G M4 with dboys M33 SPR kit
This is my SPR. before it became it's own entity. i mounted it to my G&G blow back M4a1. worked like a friggin charm just make sure you get a longer inner barrel.
Kinda turned into this. M4 spr turned mack into stock M4a1 no problems.
Last edited by Rixf3200; February 27th, 2010 at 10:13..