thewalkerdead

Hey guys, on my mk18 build I’d love some help. Started as a g&g cqbr and I’m hoping that I can get an interchangeable lower, any ideas of what I can use? What kind of lowers can I use? Hop unit? Just about anything you guys can do to help would be great

Help!

finally getting around to building an mk18 with my old g&g m4 cqbr and the rail isn’t fitting properly, any suggestions? I have already put a little tape around the barbell but to no avail and am getting a bit tired of buying new parts for cosmetic preference. Attached is a video of the rail section spinning while the nut is tight 



IMG_0864.mov