You must use a punch small enough to enter the opening where the roll pin is located, large enough to engage the sides of the roll pin which is hollow but large enough not to slip into the opening of the roll pin, get stuck and destroy the pin. Don't ask as how I became such an expert

Wheeler makes a set of roll pin punches that have a nub to fit the hole and a ledge to fit the sides. They are typically the same size punch as the hole so you shouldn’t have a problem getting it in there. Wheeler makes a set of just punches and they also make an AR toolset that has the punches that you probably need for the 15-22 plus a bunch of other handy to have stuff... worthwhile kits.


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Here is what one looks like . . .

Russ

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thanks just what i needed

Not only are specific roll pin (nubbed) punches in the set, but there is also (usually) a double ended roll pin starter, large on one end and small on the other. It will drive a pin into its channel and leave about 1/4” sticking out. You can use the appropriate punch to finish seating the pin without damaging it. Quicker and easier. Worth the money. Proper tools for the job.

3/32nds is the correct size for the bolt roll pin. Also a little tip I learned; don't drive it all the way out, just enough to release the firing pin (under spring pressure) and the recoil spring guide. This will make re-installation a breeze so your not fighting it to keep it straight.

Yes. I eventually learn! Actually this is the first gun I have that has a "roll pin" that I can think of. Wasn't aware of the need for a special tool. After a few "wacks" with a hammer and normal punch I became "aware".

Thanks. Saw a YT video also recommending not to completely drive out the pin.

There is tuition cost for becoming a home gun smith, especially for the labs. How I know this.

I am now "armed" for future damage!
Grace USA Roll Pin Punch Set 7-Piece Steel - MPN: RS-7

IMO, even better because of starters as well as less $$.

AR-Stoner AR-15 Roll Pin Punch Set 7-Piece Steel - MPN: 219163

I guess I was just plain lucky. I replaced my firing pin by driving the roll pin (mostly) out with a nail the right size. I did clip the point off first. Worked like a charm for me, but I know it was a "bubba" job.

Got to get some real punches soon. Well, I have a couple, but neither was the right size.

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Or something like that . . .

I'm not familiar with the .22 caliber AR15, is this roll pin the same as the cotter pin type firing pin retaining pin in the .223 version?

I recommend not using a regular punch like I did. It was "almost" the perfect size which resulted in the bolt visiting my gunsmith to remove the "almost perfect punch" A roll pin punch would have avoided this drama.