I read somewhere that there was an issue with the PC version's trigger going from crisp and acceptable to very heavy and back again. Ignoring this, I bought one anyway, due to a large discount, and I am experiencing the same problem. I bought a pink camo, 15-22 for the wife for Christmas, I polished the hammer and sear, and installed Jard springs. I have never had any problems with her trigger. But this PC version is baffling me. Before I give S&W a call, does anybody have a quick fix?

Never had that problem. However it could be the trigger pins. I replaced all mine with the KNS 15-22 non-rotating locking trigger pins. I had one of my stock pins pull out of the frame slightly on one of my 15-22s and when that happens the trigger usually does not work. With the KNS pins in there problem is solved permanently plus it reduces the pins wearing the frame by making them not able to rotate. My RRA trigger is back in my PC model and it has never had that issue you mention.

Thank you for the suggestion. A good friend of mine is part owner of KNS and I go there often to hang out and blow my money. lol I didn't think the KNS pins would be long enough since the pins on the 15-22 are somewhat countersunk.

KNS makes M&P 15-22 specific pins.

KNS has a set of pins specifically made for the 15-22.

Perfect!! That beats waiting on a call back! Dude is always super busy. Just so happens, I need to go to Fredericksburg tomorrow. Thanks y'all!

The regular AR KNS pins work also. They are long enough.


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Well, I dropped by KNS and picked up enough stuff to make the wife angry. lol Well, we all looked over this little gun and surmised that the trigger was not being allowed to finish it's stoke and was causing the problems. I did buy two KNS pin kits for both of our 15-22's. They aren't any more expensive than standard kits. I also finally got my PWS comp installed on my AAC 300 BLK Upper, but that is just bragging.

Well, I tore into the the thing and noticed that the safety just looked like it was a larger diameter where the trigger hits it. I wanted to install and AMBI anyway, so I disassembled the lower to do so.

As soon as I had the safety out, the trigger began to function as it should. I measured both safety selectors. There was only a slight difference, but the AMBI selector was narrower. I installed it, and continued to have proper trigger function...at least on the bench. I then installed my Tactical Solutions Comp, and KNS pin set and went outside to test it out.

I used Aguila 30 grain, 40 grain, SSS, CCI Mini-Mags, Remington Thunderbolt, and Subsonic, and Eley Silhouex. I know that the PC version is not supposed to like Sub-Sonic ammo, but I wanted to try it all. (My wife's pink camo 15-22 eats anything I put in it.)

75, horrible rounds later, I can say this rifle is definitely headed back to S&W. The trigger/sear was fine as far as releasing the hammer consistently. HOWEVER! Almost every other cartridge, the hammer would fail to fully seat back on the sear. At times, I even had fun little 2 and 3 round bursts. There were multiple light strikes and stovepipes. Just all around pitiful, no matter what ammo it was fed. And yes, the gun was thoroughly cleaned and properly lubed before the test fire. I did everything I could to eliminate variables.

Just for fun, here is the pictures of the two safety selector measurements.

Attached Images

	safetylongstock.jpg (49.3 KB, 31 views)
	safetyshortCMMG.jpg (44.2 KB, 33 views)

IMHO, I would NOT send in any rifle that you modified anything in the fire control area unless it can be returned to unmodified, seems that would void any warranty, to me anyways?

__________________
Todd
M&P15-22 tweaked

And the gun didn't do this BEFORE you worked on it? It started doing this AFTER you worked on it?

Modified rifles returned to S&W for warranty work will be returned in factory stock condition - and you won't get the mod parts back!

You're sure? I know this is Rugers' BS policy but with S&W my experience has been (with my competition revolvers anyway) that they'll leave your mods alone. It's been a while since I sent them anything. Last I had done was a barrel change that required an older style yoke also so it went to them. I did put in the note it was a gun used for competition. Maybe things have changed?

According to statements from S&W published some time back, all firearms are returned in factory stock condition. Can't find a copy of that, though. I, personally, would not risk it, but that's me.

No worries, I was going to throw their junk safety selector and pins back in the receiver, and pull off my comp, before I returned it. That is all that was changed. Nothing to do with the trigger, sear, or hammer was changed or altered.

I am not going to take a chance on S&W refusing the warranty or mixing up my parts and loosing them. My theory is, if I can solve the issue without sending it back, why not save myself the hassle. Especially after reading multiple threads about S&W's lengthy repair and shipping issues.

Finally, YES, all the issues to include stovepipes, double or triple fires, light hammer strikes, and failure of the hammer to reset were all occurring before I touched a thing. The only problem I managed to solve was the trigger being hard to pull because it was contacting the safety selector.

Our department went to M&P 40's...I sure wish they would have been able to make a deal with Springfield for the XD's. I'm not feeling a lot of confidence in S&W right now.

Yes, but they don't fully engage the tabs on the pins because the 15-22 receiver is significantly wider because the walls are thicker than an alloy AR reciever. You can fairly easily pop the not screwed end off the trigger pin if you try when using an AR set of the pins. With the shorter AR pins the shaft doesn't go all the way thru so the tabs on the end start gouging the polymer and can damage the pin holes in the receiver.

If the hammer was not fully reseating it sounds like you put the one or both springs in backwards and it is not getting enough force to hit the firing pin hard enough.

I would agree with that, if it hadn't done the same thing from day one. Even though I've been building, repairing and tinkering with AR's for 20 years, I always go back to basics and pull out my schematics. I also compared it to my Daniel Defense M4, my wife's 15-22, and my Rock River. All springs were set up the same way. I do applaud your approach, as I thought the same thing had happened when I first shot it. It might say, Performance Center, but that doesn't mean there wasn't a human building it, and we all mess up sometimes.

photoracer, even though I had already boxed it up, I couldn't help but open it up and check it again! Unfortunately? The springs were correct. I just couldn't stand not checking it over for the 100th time.

I hear you on that. At my age short term memory can be used as an excuse to look again.