“Great upper with machined aesthetics. The integrated forward assist pin makes assembly of this upper such a breeze. Their matching lower comes with an integrated battery assist pin and upper adjuster pin. Aero has truly thought of ways to make your assembly convenient and effecient.”
“upper is solid quality, exactly like you'd expect from aero. m4e1 is totally worth the extra $20 from the standard version. only downside for me is it was missing the forward assist screw which must've backed out and fell out of the box. now trying to figure out where to find one”
