I have an AERO M5 complete upper that I purchased and a AERO nickel Boron bolt carrier and bolt. I put it on a Noreen stripped lower that has a Giselle SSE trigger. When I attempted to load the chamber with a round from a magazine, it would not fully go into battery to enable the weapon to fire. I was initially using a Brownell's mag, so I changed the mag and used a DPMS with the same results. I then attempted to single load the weapon by dropping 1 in the chamber without the mag installed and the weapon fired and cycled exactly like it should.

I then replace the bolt and carrier for a DPMS that I had in another weapon, and it loaded, fired and cycled correctly the entire DPMS mag and The Brownell's mag. I then put the original AERO bolt carrier back in and again tried to load the weapon, but it would slow down and hang up preventing it from going into battery.

I thought it might be that this was all brand new and had not been broken in but determined that the bolt carrier was hanging up on the mags when installed. Anyone have any idea what would cause this with the AERO carrier, but not the DPMS carrier?

I am back overseas so I cannot take any photos at the moment.

Thanks

really?? 115 views and NO ONE has any insight to the issue. This place used to be the go-to place where at least 1 person had the answer.

Thank you, I will check into that.

I had this issue with an AR-15, there was so much interference between the top of the hammer and the bottom of the bolt carrier I could hold the bolt open with trigger pressure alone.

The rifle would fire, but you could feel that it was sluggish.

It fires correctly when using a DPMS bolt carrier in the completely preassembled AERO Atlas upper. I had used this geissle trigger in the DPMS.308 prior and decided to use it in this Norreen stripped lower I had bought.

I've built plenty of stripped lowers in the past and the parts are correctly assembled. Without a mag installed, it goes into battery and fires with no issue.

NiB carriers are junk.

It looks like your problem when away when the BCG was swapped out. Its the carrier and likely the coating.

Get rid of NiB and don't look back.