Rolled pin vs rivet for pinned stock?

Heatwave3 · Mar 10, 2013

I live in NJ and therefore the stock on my 15-22 is pinned from the factory in the most extended position. I would like to shorten the stock by 2 notches (I think) and then repin the stock in the new position.

The pin used from the factory is a "rolled pin". I was planning to follow instructions from the forum to use a drill bit just "slightly larger" than the inside diameter of the factory rolled pin. Once the drill bit is inside the pin, then pull the entire pin out use the drill.

Is removal any more complicated than this?

Next I planned to reposition the stock, drill through the original factory hole with the same diameter bit as the factory hole, then use an aluminum rivet to repin the stock in the new position.

Is there any issue using a rivet instead of a rolled pin? Is there anything else I need to be considered for this job? Thanks for any feedback.

ldvose · Mar 10, 2013

I would use a roll pin because of the location of the hole. I think the rivet head would stick up too far

gm272gs · Mar 10, 2013

You can just drive a roll pin out with a pin punch. No need to introduce a power drill to your polymer stock, brother!

Roll pins can be reused.

I don't have a fixed-stock M&P 15-22, but what you describe sounds like an easy fix. Just drive out the roll pin with a punch, reposition the stock where you want it, and re-install the roll pin in the requisite hole.

UNLESS, there aren't other holes in the stock in which to install the roll pin?

Bulldogg · Mar 10, 2013

I personally wouldn't use a rivet the roll pin you take out is reusable. You can re use the original hole in the buffer tube no need to make another. Simply pull the pin out of the stock place the stock in the new desired position, then measure the difference, probably 2 inches then mark it on the stock. This way you have two holes in the stock which is easily replaceable and only one in the buffer tube which is all part of the lower assembly. JMO.

Bulldogg · Mar 10, 2013

gm272gs said:
You can just drive a roll pin out with a pin punch. No need to introduce a power drill to your polymer stock, brother!

Roll pins can be reused.

I don't have a fixed-stock M&P 15-22, but what you describe sounds like an easy fix. Just drive out the roll pin with a punch, reposition the stock where you want it, and re-install the roll pin in the requisite hole.

UNLESS, there aren't other holes in the stock in which to install the roll pin?

The pin is pressed in one side only and can't be knocked out without drilling through to the other side. Drill bit removal to me is the best way doesn't damage anything or put in additional holes. Stock has one hole for pinning from the factory for compliant states. Easiest to just make another small hole in the stock and reuse factory hole in buffer tube.

Heatwave3 · Mar 10, 2013

Bulldogg said:
The pin is pressed in one side only and can't be knocked out without drilling through to the other side. Drill bit removal to me is the best way doesn't damage anything or put in additional holes. Stock has one hole for pinning from the factory for compliant states. Easiest to just make another small hole in the stock and reuse factory hole in buffer tube.

This was my thinking. There's no way to get to the back side of the pin without drilling another hole on the opposite side of the stock. I would prefer NOT drilling additional holes in the stock if it can be avoided. Therefore the only way to remove pin is to pull it out. But there's very little of the pin exposed to use in pulling it out.

Once its out, then I will need to reposition stock, drill a new hole through the original hole in the stock and into the new location on the buffer tube. Then reinstall the pin to be legal in the new location.

Just curious, what notch do most of you keep the stock positioned at when shooting at a range?

Here's a picture of a pinned stock.

laskt9 · Mar 10, 2013

When you take the pin out does it move and lock into place like a normal stock would?

Sent from my HTC PH39100 using Tapatalk 2

Heatwave3 · Mar 10, 2013

laskt9 said:
When you take the pin out does it move and lock into place like a normal stock would?

Sent from my HTC PH39100 using Tapatalk 2

Yes, once the pin is removed, the stock would function like any other stock on a 15-22...however they would be illegal in NJ.

gm272gs · Mar 10, 2013

Heatwave3 said:
This was my thinking. There's no way to get to the back side of the pin without drilling another hole on the opposite side of the stock. I would prefer NOT drilling additional holes in the stock if it can be avoided.

A photo is always good. Yes. I would think that putting a drill bit inside of the roll pin may make it more able to be extracted. As I said, I haven't seen that type of (non-adjustable, People's Republic of California stock) in person, before.

Good luck. If you have this stock, then I imagine that your state mandates this type of stock. Changing it therefore, is tantamount to breaking the law.

Heatwave3 · Mar 10, 2013

gm272gs said:
A photo is always good. Yes. I would think that putting a drill bit inside of the roll pin may make it more able to be extracted. As I said, I haven't seen that type of (non-adjustable, People's Republic of California stock) in person, before.

Good luck. If you have this stock, then I imagine that your state mandates this type of stock. Changing it therefore, is tantamount to breaking the law.

Actually the law only requires that the stock be non-adjustable. Changing the position isn't an issue so long as it's still pinned since obviously different owner's will have different arm's length.

So here are pictures after removing the factory pin and replacing with a SS set screw (1/2in 8-32) in place of the rolled pin.

I drilled the stock for each position. For others that might decide to to do, the pin can be easily removed. Simply take a drill with a bit that is just about the side of the inside diameter of the rolled pin. Turn the drill very slowly till it grabs and lift the pin out. The whole process takes less than 15 secs.

Then take a drill bit about the same size as your 8-32 set screw and drill about a .25in or so into the buffer tube through the existing hole that came from the factory. I decided to drill a set hole for each of the 6 positions. Be aware that if you decide to do this, the hole for the "0" position will be visible when the stock is in the #4 position. The 0 and #1 position hole will be visible if the stock is set to the #5 position. If you keep the stock in the #6 position, then the holes from the 0, #1 and #2 positions will all be visible on the buffer tube.

Below are pictures of my stock pinned in the #3 position (no holes visible) and in the #4 position (1 hole visible).

Bulldogg · Mar 11, 2013

Heatwave3 said:
Actually the law only requires that the stock be non-adjustable. Changing the position isn't an issue so long as it's still pinned since obviously different owner's will have different arm's length.

So here are pictures after removing the factory pin and replacing with a SS set screw (1/2in 8-32) in place of the rolled pin.

I drilled the stock for each position. For others that might decide to to do, the pin can be easily removed. Simply take a drill with a bit that is just about the side of the inside diameter of the rolled pin. Turn the drill very slowly till it grabs and lift the pin out. The whole process takes less than 15 secs.

Then take a drill bit about the same size as your 8-32 set screw and drill about a .25in or so into the buffer tube through the existing hole that came from the factory. I decided to drill a set hole for each of the 6 positions. Be aware that if you decide to do this, the hole for the "0" position will be visible when the stock is in the #4 position. The 0 and #1 position hole will be visible if the stock is set to the #5 position. If you keep the stock in the #6 position, then the holes from the 0, #1 and #2 positions will all be visible on the buffer tube.

Below are pictures of my stock pinned in the #3 position (no holes visible) and in the #4 position (1 hole visible).

I did it like this with the extra hole in the stock. This way the stock is easily replaceable, with no additional modification to the lower. I couldn't bring myself to drill the extra hole in the buffer tube which is all part of the lower.

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Rolled pin vs rivet for pinned stock?

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