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2,159 Posts
I have a SBR MP5k BMP barreled upper based clone, and is a great shooter, never the first jam, accurate, and all in all a good upper but I just got a QD Hk flash hider. I can tell its 9mm as it wont fit on my .40 by a long shot, but when I slip it on, I can not get the cross bar to go back down. When holding next to the trilugs, it appears as if the cross bar is still too high to latch behind the lugs by a distance roughly equil to the width of the latch bar itself. The FH runs all the way flush to the sight tower. Is the barrel not to spec?I am sure its not the flash hider. Install error/user error

