mp 15 22

[bigstick0000]

new on here. my grandson has an mp 15 22 rifle. the rear take down pin that marries the upper to the lower fell out. sw sent a new one. there is a small brass pin in the lower that flops around. does anyone know to put the new replacement pin in? I called smith and Wesson and the person I talked to had no idea. Anyone out there know? thank you in advance

 

[tomcatt51]

You need to remove the pistol grip. You need to be careful. There's a screw inside the grip that holds the grip on and the grip traps the take down pin and safety springs and detent pins/plungers.

As you loosen the grip screw (slowly), watch the right side where the grip meets the lower. As the grip separates from the lower, in the gap you'll see two springs that the grip traps and holds in place.

The springs have detent pins/plungers on top of them. One is the detent for the take down pin you are replacing, the other is the detent for the safety.

The pistol grip is a snug fit on the lower. It may need a little help to come off. Loosen the screw a little then work the grip off a little. You're looking for the springs in the gap as the grip separates from the lower. You don't want to have grip come off suddenly launching the springs and plungers.

So, remove the pistol grip carefully keeping track of the springs and detent pins (and which hole they were in), put your new take down pin in and reassemble.

SNUG BUT DON'T OVERTIGHTEN the grip screw when reassembling. It threads into the polymer lower. They can be stripped out. Don't play gorilla when tightening the screw.

 

[Kenneth07ex]

First off, Welcome to the forum!
Is it possible, that it's the detente pin? The one that holds the take down pin in place? I've not removed the grip on mine yet, so I couldn't say if it's brass or not. But I have been into most of the lower, and there's not anything brass in there.
And it would also seem likely that the spring seems to have gone missing, and left this pin to rattle.
My thought, would be to watch a YouTube video, on changing the grip. There's a small difference in assembling the ar grip vs.the 15-22, and the difference is particular to the spring, and pin, in question. So the video might give more clarity to the issue.

 

[RV4driver]

Wrap the whole assy. in a piece of clear plastic. Then when the parts launch into orbit, the orbit is considerably smaller. Ask me how I know...

 

[GhostMutt]

This thread closed after what tomcatt51 wrote. 100% correct answer.

 

[Luke79]

Agreed on that. Although the clear plastic story intrigues me and I would like to hear the rest of it. He said ask me how I know... I am all for sharing my mistakes so hopefully others don't ever have to deal with a similar situation however comical that it may be in hindsight

 

[GhostMutt]

Agreed on that. Although the clear plastic story intrigues me and I would like to hear the rest of it. He said ask me how I know... I am all for sharing my mistakes so hopefully others don't ever have to deal with a similar situation however comical that it may be in hindsight

I recall the first time i removed the extractor...after watching a you tube "how to" video.

I was in the lounge...working on the coffee table. I use a porcupine quill for pretty much all my cleaning and maintenance tasks with my rifles...pushed the quill onto the plunger and worked the extractor free....then 3-2-1 we have lift off. The plunger launched clear across the room. It hit the corner of the TV set, which changed its trajectory upwards, where it hit the curtain rail. I was watching this horror show unfold thinking...'oh no its going to land in the labyrinth of entangled wires behind the the TV in 'no mans land' never to be found again. Luckily for me it rebounded off the curtain rail and once again altered course this time toward the kids giant bean bag seat. I lost sight of it at this point. When the dust had settled i placed the bolt assembly down and walked over to the bean bag. There, dead centre on top of the only pristine white, unpatterned cushion on the bean bag, was the plunger.

From then on, i have learned how to do it so as not to send it into orbit. You are right we learn from our mistakes.

 

[RV4driver]

Agreed on that. Although the clear plastic story intrigues me and I would like to hear the rest of it. He said ask me how I know... I am all for sharing my mistakes so hopefully others don't ever have to deal with a similar situation however comical that it may be in hindsight

I had just recently told a handgun class that if you were going to takedown a pistol past the field strip stage, be sure to put the gun in a clear plastic bag for the inevitable explosion of small parts. Then, being a "do as I say, not as I do" kinda guy, I pulled the action out of the frame of my BG380. I did find the part, but did it AGAIN shortly after that. That time it took two hours to find the spring. My wife thought this was hilarious.

 

[Blackstuff]

I recall the first time i removed the extractor...after watching a you tube "how to" video.

I was in the lounge...working on the coffee table. I use a porcupine quill for pretty much all my cleaning and maintenance tasks with my rifles...pushed the quill onto the plunger and worked the extractor free....then 3-2-1 we have lift off. The plunger launched clear across the room. It hit the corner of the TV set, which changed its trajectory upwards, where it hit the curtain rail. I was watching this horror show unfold thinking...'oh no its going to land in the labyrinth of entangled wires behind the the TV in 'no mans land' never to be found again. Luckily for me it rebounded off the curtain rail and once again altered course this time toward the kids giant bean bag seat. I lost sight of it at this point. When the dust had settled i placed the bolt assembly down and walked over to the bean bag. There, dead centre on top of the only pristine white, unpatterned cushion on the bean bag, was the plunger.

From then on, i have learned how to do it so as not to send it into orbit. You are right we learn from our mistakes.

I did the same but in my mancave which has untold amounts of cr@p in and i would never have found it, fortunately it pinged right into the dump pouch i have on my PSG belt which just happened to be on the bench at the time!

Also did the same last night disassembling a Walther MP5 bolt carrier housing. The back plunger on that came out with such force it dented the door it hit!!