“I just wanna say I've built numerous ar15s. And the last couple I've built I used nothing but aero precision parts. These uppers to me are the best along with their lowers. You get such good fit. add a atlas s one hand guard and your set.”
“Aero Precision's M4E1 is a much improved version of its already good MILSPEC upper receiver. The redesign changes the backside to a flatter angled look that improves the stiffness of the upper receiver. Stiffness is what you are looking for in any AR that you intend to use for accuracy at longer ranges. Paired with a good free floated barrel, this upper will give you improved accuracy over a MILSPEC upper receiver, and at a cost severely less than a billet upper that seeks to do the same.”
