Beretta686
New member
I'm going to get a Colt-pattern 9mm upper for my M16 lower, but I'm not sure which one. I'd like to get a bolt that won't need to be modified to run with a non-9mm hammer nor with my M16 on full-auto.
I previously had a M1S 9mm upper on my SBR and it ran great, but the market has changed since I got that almost 10 years ago.
Does anyone have a recommendation or are they all pretty much the same?
I previously had a M1S 9mm upper on my SBR and it ran great, but the market has changed since I got that almost 10 years ago.
Does anyone have a recommendation or are they all pretty much the same?