AR firing pin scratched

[Jstevens56]

Not sure if this is something to be concerned about or not.

After my first outing with a new bcg in an ar pistol that I built, the firing pin shows quite a bit of scratches. I've never seen this before on any other firing pins and not 100% sure if it was like this from the start or it happened while shooting, but I don't remember seeing it when I did my initial cleaning before I ran it.. I probably went through 200rds before noticing it.

Any idea what could cause it or if it is of concern? Haven't tried swapping out the pin yet, wanted to get some opinions first.

 

[BradMacc82]

Couldn't say what the issue is, but there is an issue somewhere.

Pulled the pins out of 3 of my BCG's with round counts varying from 1 single shot, to almost 8k rounds. None of them have any marks like the above pictures.

 

[lx1x]

Check inside the bcg. Either something got in there or burs inside the pin hole.

That does not look normal wear.


Replace it also. Dont want a stuck pin either. Going fa is not good.

 

[Gdud50]

I've never seen a scratch like that and I've fired tens of thousands of rounds through multiple m4's.

You might have something moving in your gun that shouldn't be.

 

[bkuether]

What is interesting is the striations are perpendicular to the movement of the pin when it is struck.

I don't know a lot about ARs, but that's really WEIRD.

 

[BradMacc82]

Who's the Manufacturer of the BCG?

 

[Jstevens56]

Who's the Manufacturer of the BCG?

Don't want to say right now, I wanted to get some opinions before contacting the manufacturer/seller. It's a reputable company, I'll probably contact them this week and see if they've ever had similar issues with this bcg.

 

[BradMacc82]

Don't want to say right now, I wanted to get some opinions before contacting the manufacturer/seller. It's a reputable company, I'll probably contact them this week and see if they've ever had similar issues with this bcg.

Fair enough.

If I had to take a stab in the dark, lx1x's thought of a burr inside the bolt sounds like a winner to me, but as always, I could be wrong.

 

[BradMacc82]

Possibly the cam pin somehow doing it?

 

[101combatvet]

Is the tip of the firing pin bent also? Could be the shot but it looks bent. Look at the inside of the bolt cam pin to see if there are any marks. Look at where the firing pin enters the bolt. Have you inspected those areas?

 

[rj1974]

Possibly the cam pin somehow doing it?

This

Looks like there may be a burr inside your cam pin . How many rounds have you run through it with that firing pin ?

 

[Jstevens56]

This

Looks like there may be a burr inside your cam pin . How many rounds have you run through it with that firing pin ?

It's in the first post. About 200. I'm going to inspect the carrier and bolt when I get home later. I'll post my findings then.

 

[Russ D]

Change your cam pin and get a new firing pin. If it still persists then take it to a good smith. If you live anywhere near Carroll County I have both parts you can borrow to try.

 

[Jstevens56]

Change your cam pin and get a new firing pin. If it still persists then take it to a good smith. If you live anywhere near Carroll County I have both parts you can borrow to try.

I have other BCG's I just would prefer not to swap those and have another pin messed up.

 

[sailskidrive]

I had a bad cam pin in a RRA bolt a few years back and it did the same thing to the firing pin.

 

[amoebicmagician]

I had similar marks on a firing pin once after changing to a m-16 style BCG

turns out there was a jagged scratch inside the firing pin channel with burrs on it.

A few passes with a very tiny file and everything was honky dory

I at first pushed a really really small cleaning jag through there, and that did seem to help, but until I actually went at it with the file you could feel and hear resistance and scratching when you would manually pull the firing pin back and forth

 

[amoebicmagician]

oh, and once you fix the burrs, smooth out the scratches on or totally replace the firing pin, or it will cause problems of it's own

 

[Jstevens56]

oh, and once you fix the burrs, smooth out the scratches on or totally replace the firing pin, or it will cause problems of it's own

Yup, if its just a bur ill just get a new firing pin, or just borrow on from a new BCG I have laying around

 

[Boss94]

Thats definetly cam pin rubbing on the firing pin. It must have some sharp edges on it.

 

[Boss94]

the cam pin may have rubbed a bur in the back side of the bolt so check there to !