Hammer pin

[Slow]

i have had several AR's this is my first to assymble from parts laying around.

i picked up an RRA receiver and assymbled the FCG. and i noticed the hammer pin rotates with the hammer.

Is this normal?

i do know about antiwalk, and anti rotation pins, i dont plan on putting a large amount of rounds thru this rifle, but i was wondering if this is not normal. it looks like it would cause the pin hole to wallow out and i will try and fix it, if normal i wont worry about it.

thanks for any replies.

[Headstrong]

i have had several AR's this is my first to assymble from parts laying around.

i picked up an RRA receiver and assymbled the FCG. and i noticed the hammer pin rotates with the hammer.

Is this normal?

i do know about antiwalk, and anti rotation pins, i dont plan on putting a large amount of rounds thru this rifle, but i was wondering if this is not normal. it looks like it would cause the pin hole to wallow out and i will try and fix it, if normal i wont worry about it.

thanks for any replies.


As far as I know this is normal which keeps them wearing normal on some. Sometimes pins will "walk" out the side of the lower receiver. This generally happens because the hammer/trigger pins are only held in place by spring tension bearing against indentations cut around the circumference of the hammer and trigger pins. If the spring jumps the indentation, the pin is free to move out of position, hence "walking out" of the receiver. However I have shot many rounds in different AR's and have had no problems with them falling apart. I will say on my Rock River that I have set up for varmints, has anti walk pins with the external e-clips. I put them in with a JP trigger, although I had no problems before I put them in.

[nhbandit]

While I'm no expert I would guess it's not a good thing. Having the pin rotate in a hardened steel hammer=good... having it rotate in an aluminum casting=not good...

[O'Possum/TX]

While I'm no expert I would guess it's not a good thing. Having the pin rotate in a hardened steel hammer=good... having it rotate in an aluminum casting=not good...

As he says, it is better for the hammer to rotate on the pin than for the pin to rotate in the receiver.

I would pull the pin and hammer and make sure the pin rotates smoothly in the hammer. A little polishing and lubrication might be in order!

If you find you need to polish the pin, only polish the center where the hammer rides. You may also find a burr inside the hammer's pin hole. Polish what needs polishing. Don't get too agressive with your polishing though. If the clearance is too great, the trigger pull will get strange as the hammer wallows around on the pin.:(

[hillmillenia]

There are outfits that manufature anti-rotate, anti-walk pins and holders but they are mainly selling a fix for something that is not broken.:)