Anti-walk pins for M&P 15-22

[73BLow]

I bought an M&P 15-22 last week. I took it to the range on Friday to get it sighted in and proceeded to run a couple hundred rounds of various standard velocity ammo through it without a single issue. Yesterday, I brought it to the range and decided to use CCI mini-mags. I went through the first 10 rounds with no problems and then on the second mag I thought something was wrong. After putting the safety on and clearing it, I was surprised to find I could pull the trigger and the hammer dropped with the safety on.

I broke it down for further inspection and found that the trigger group pins had walked just far enough out of the holes in the receiver for it to move about a millimeter. I straightened the trigger group and pushed the pins back in and decided to go back to standard velocity rounds. I went through a couple hundred more rounds without any problems.

So my questions are:

Do you think the mini mags are too much for the plastic receiver? It recommends them in the manual.

Or, should I just put some anti-walk pins in it?

Thanks,
Brian

 

[noxin]

I've shot mini-mags, stingers, velocitors, and a bunch of other ammo in my 15-22 and never had an issue. They might have been near the edge of the holes and walked just a little bit? I would center them and try to reproduce it.

 

[Gator9329]

.

 

[NewGunGuy]

Well here come the black heli's for you talking about this on an open forum!

Charles.

 

[73BLow]

Ok, I'll just use it as is unless it keeps happening. Thanks

 

[Gammon]

JP makes a set of pins for short money. Try Brownells.

 

[WallHack]

Well here come the black heli's for you talking about this on an open forum!

Charles.

Yeahhhhh, admitting you inadvertently possessed an illegal machine gun for even a short period of time on a public forum isn't a good idea. Might want to edit your OP.

Anywhozle, I'm hoping to pick up a 15-22 on the morrow. I fired one back when S&W's range was still open to mere serfs, it was a blast. Although those 10-round mags are all but useless....

 

[jsh]

I've shot mini-mags, stingers, velocitors, and a bunch of other ammo in my 15-22 and never had an issue. They might have been near the edge of the holes and walked just a little bit? I would center them and try to reproduce it.

This. I have a 15-22 and shoot mini mags almost exclusively, never had any issues like this. 1000s of rounds.