I'm thinking since bear creek uses a DPMS lower their amend 2 22 250 mag would work in my Aero lower. Going to buy a couple and find out.

A picture is worth a thousand words but the 22 250 does work. A specialized dynamics video, he said you can run 7 rounds in any 10 round mag or 5 in a 5 round mag no problem. Mine cycles 7 rounds no problem. That's works for me.

So I picked up one of these BCA 22-250s. Shot it last night a few times. I had two misfires with a dimple on the primer but not a deep one. A couple of the primers on fired rounds had holes in them and at least one more was cratered. This was out of eight rounds. Have not messed with ARs as much what should I be looking for? Is this trigger related, firing pin?? It was factory Remington ammo. 55gr psp.

I would start by disassembling the bcg and making sure it's clean and the firing pin is free. I would also measure a fired case and check headspace. Make sure the bolt is rotating all the way when closing and I would also extract a cycled round to see if it is getting dented or beat up in the cycling process. Where is ejected brass landing?

I was standing in the back of a gator shooting off the cab sighting some backup sights. Cab is about 6 ft high. It was slinging them about 4-5 ft to the right kind of behind me. I will check some of that stuff. Thanks.

Well if brass is slightly behind it is not over gassed.

It’s possible you could have a ammo inconsistency problem with light strikes and pierced primers. Do the pierced primer rounds look like their smashed flat on the whole back of the case. The barrel nut might be loose, trigger group might be bad, bolt carrier might have issues. Is the firing pin half round on the end. Try taking the bolt carrier out of the upper. Push the bolt back into the carrier, take a screw driver and push the firing pin back and forth to see if it slides up in the bolt easy so it would hit a primer with no resistance. A new 110.00 bcg with a 100.00 drop in trigger and a tight barrel nut should fix it or the 30 day guarantee.

Thanks guys been busy the last few days and have not had time to look at it. I will check all this stuff and report back.

BCA a10 uppers require a DPMS gen 1 type lower. I would call them and make sure your lower is compatible, the cut(shape) between trigger and buffer tube matters. All factory ammo should run fine.

I also picked one up. Upper functions and cycles good so far. I’m 40 rounds into it now.
It did fail to load twice early on

When shooting Remington 50 grain jhp every primer blows a hole threw it where pin strikes.

Switched to varmageddon 55 grain and primers are near perfect after being fired.

I was shooting off tri pod and brass landing at 5 o’clock position.

I chalked the holes in primer up to Remington bullets… I may be wrong to assume this. Please let me know more

I would measure a fired case to verify proper headspace and chronograph it.
Pressure equals speed. If it's really fast the psi is really high lol. If they aren't overly fast psi won't be overly high.

Might even be worth turning the gas off, shooting one and measuring a fired case to eliminate case stretch from the bolt opening while chamber pressure is still high.

Thanks- here is a [img:left]https://ibb.co/ThrGW6t[/img] picture

Copy the BB code and paste it.

Thanks alf -
I’ve tried posting piks many mays in past. I never get it right.
Thanks again


Update: I have now tried 4 different brands of ammo. only these Remington 50 gr jhp seem to blow holes in primer .

I do not have a chronograph . Maybe in my near future though

Primers don't look excessively flat. Appears to be a few case head marks but hard to tell in that pic.