Originally Posted by
wanderson
Swapping uppers or replacing a trigger (fire control group) is as easy as pushing out a few pins, and I can guarantee that any trigger upgrade isn'tgoing to affect the resale of a S&W MP15 one nickel.
Any mil spec AR upper will fit.
And anyone who needs an armorer to swap an AR upper shouldn't be allowed to have one. It's two pins you can pop by hand.
FWIW I've got ARs in a half dozen different calibers. And a half dozen different brands of uppers & lowers. They all work.
And any gas system from 20" rifle length to 8" pistol length will worh with a std. m4 carbine buffer setup.
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