Need some suggestions...

[SonofWWIIDI]

I built a dedicated .22 upper for my m&p lower. Used an m&p upper, cmmg conversion kit w/barrel, blackdog magazines. I tried 3 types of ammo,

Remington golden
CCI mini mag (choot 'em Landry signature series).
And some CCI hi velocity (steel case)

My problem:
With both the Remington and mini mag, when charged the rifle didn't go back to full battery, resulting in the firing pin not making contact with the bottom of the shell casing (no forward assist). Removing the mag and recharging then reinserting the mag worked to fire the original shot, but the follow up still would not close the bolt completely.

The steel case hi velocity worked perfect. Every time. I shot 3 full mags using it, without issue (couldn't shoot more as the ammo was borrowed from a friend.

I don't really want to buy a lot of the hi velocity as it is kinda pricey, and I have plenty of standard (Remington, mini mag, m-22).

I put some extra lube on the bolt, and I even lubed up a few of the cases that weren't working, all to no avail. The steel cased stuff was all that functioned.

So, aside from buying a crapload of the much more expensive hi velocity, I'm looking for suggestions as to what I might try next.

Sorry for the wall of text!

Thanks for you help!

[Rosebud22]

And some CCI hi velocity (steel case)

I don't think CCI makes steel case ammo in .22.
They were most likely CCI stingers that have a
nickel finish on brass. These cases are slightly longer
then standard .22lr and therefore have more powder
and more punch. Sounds like your bolt is binding up.
I have never had a gun that would not shoot CCI
mini-mags. I am sure there are expections, but
if it won't shoot mini mags, I would guess it is
not a ammo problem but an issue with the gun.
I have found a good magnifing glass and good
inspection of moving parts can solve the problem
Best of luck

[Bastard]

generic response;
clean the crap out of it.
re-lube it & try again.

OK with that out of the way;
#1 don't use Remington golden bullets.
#2 don't use Remington golden bullets.
(obviously I am not a fan) I have never seen anything dirtier than the GB

what lube are you using?
is is your first time shooting it?

you could try locking the bolt back and leaving it for a day or so to help loosen up the springs.

[lordres]

Are you running that upper with a buffer? If not, try it with the buffer. If so, maybe you'll want to try that taccom plug that other people have raved about. I've never had issues with my factory CMMG upper, but I picked up their reliability kit anyways.

[SonofWWIIDI]

I don't think CCI makes steel case ammo in .22.
They were most likely CCI stingers that have a
nickel finish on brass. These cases are slightly longer
then standard .22lr and therefore have more powder
and more punch. Sounds like your bolt is binding up.
I have never had a gun that would not shoot CCI
mini-mags. I am sure there are expections, but
if it won't shoot mini mags, I would guess it is
not a ammo problem but an issue with the gun.
I have found a good magnifing glass and good
inspection of moving parts can solve the problem
Best of luck

I believe you're right. They were nickel, not steel. I will give it another through inspection.

generic response;
clean the crap out of it.
re-lube it & try again.

OK with that out of the way;
#1 don't use Remington golden bullets.
#2 don't use Remington golden bullets.
(obviously I am not a fan) I have never seen anything dirtier than the GB

what lube are you using?
is is your first time shooting it?

you could try locking the bolt back and leaving it for a day or so to help loosen up the springs.

Was the first time shooting it. Lubed it with some blue wonder spray on lube. And tried some gun oil at the range after it didn't work.

Normally I wouldn't ever shoot rem gb's, but I have had them for awhile a figured I might as well use them up. They worked fine in my buck mark contour, so I figured they might work I the AR.

Not sure how loosening up the springs would help. The bolt cycled, it just wouldn't close fully once it went back into battery.

Are you running that upper with a buffer? If not, try it with the buffer. If so, maybe you'll want to try that taccom plug that other people have raved about. I've never had issues with my factory CMMG upper, but I picked up their reliability kit anyways.

I am running it wither the buffer in place, and the rubber plug, I don't recall the brand name for it. But is a small (maybe a couple of inches long) cylinder with one end being shaped shaped.

What is the reliability kit?

Thank for all your helpl