Part 2 of the CMMG and Aero 9mm ar pistol build. This gun ran flawless without any modification to the upper.

This is a Aero M4E1 upper with a standard ejection port. Once I finally got the red dot dialed in this gun was a tack driver.

It took me an entire mag to dial in the red dot, completely my fault I was being extra special this day. It didn’t help I was firing 3 to 5 rounds before adjusting it.

The focus of this range day was to see if the rounds would eject and the gun would cycle. The only oil on the gun is what came on the bolt. minimum oil and brand new the gun ran great.

This has now become my favorite AR pistol I own. Over my 7.62 and 300.