Marking cam pins?

**Disciple** · 08-06-20, 21:06

This is an interesting idea: https://www.forwardcontrolsdesign.co...Pin_p_206.html However I don't see why I can't mark a cam pin myself. Would it be OK to make a small notch in the region of the dimple using an abrasive stone or file?

scp.jpeg

**Leonardo** · 08-06-20, 21:07

Originally Posted by Disciple

This is an interesting idea: https://www.forwardcontrolsdesign.co...Pin_p_206.html However I don't see why I can't mark a cam pin myself. Would it be OK to make a small notch in the region of the dimple using an abrasive stone or file?

Shouldn’t hurt anything......seems like a great idea

**JediGuy** · 08-06-20, 21:16

Originally Posted by Disciple

This is an interesting idea: https://www.forwardcontrolsdesign.co...Pin_p_206.html However I don't see why I can't mark a cam pin myself. Would it be OK to make a small notch in the region of the dimple using an abrasive stone or file?

scp.jpeg

It’s fine. Or use the same punch you use to stake your castle nuts.

**titsonritz** · 08-06-20, 21:22

It's not a bad idea, I think I'll center punch my cam pins.

**Pappabear** · 08-06-20, 21:44

Ive had cam pins that have crazy groves in them when I cleaned them last. It was strange and didn't look normal.

Edit: Damn that video explained exactly what I was referring. But I dont understand why flipping them around makes any difference. I hear the guy but dont understand why it matters. Educate me Titsonritz.

PB

**titsonritz** · 08-06-20, 23:09

Originally Posted by Pappabear

Ive had cam pins that have crazy groves in them when I cleaned them last. It was strange and didn't look normal.

Edit: Damn that video explained exactly what I was referring. But I dont understand why flipping them around makes any difference. I hear the guy but dont understand why it matters. Educate me Titsonritz.

PB

Because the wear becomes consistent, essentially forms a custom fit. Flipping it around will make different wear on both sides. Picture this, if you never once removed your cam pin it will have a little on one side and lot on the opposite side, if you flip it around it will wear a lot on both sides. This wear will over time will oblong the cam pin hole in the bolt. The two most common places a bolt will fail are the lugs on either side of the extractor and the cam pin hole. I'm sure it is a minor issue and will only come into play with high volume users, but I'll take what I can get for nothing but a consistent practice. At least that is what I'm getting out it and hope my dribble makes sense as I'm a few drinks deep.

I think FCD's site description is perfectly accurate when it calls this as a "why didn't I think of it" moment.

**Steve-0-** · 08-07-20, 04:12

Originally Posted by titsonritz

Because the wear becomes consistent, essentially forms a custom fit. Flipping it around will make different wear on both sides. Picture this, if you never once removed your cam pin it will have a little on one side and lot on the opposite side, if you flip it around it will wear a lot on both sides. This wear will over time will oblong the cam pin hole in the bolt. The two most common places a bolt will fail are the lugs on either side of the extractor and the cam pin hole. I'm sure it is a minor issue and will only come into play with high volume users, but I'll take what I can get for nothing but a consistent practice. At least that is what I'm getting out it and hope my dribble makes sense as I'm a few drinks deep.

I think FCD's site description is perfectly accurate when it calls this as a "why didn't I think of it" moment.

While I respect Roger and Chads perspective on marking a cam pin. My 2cents after seeing functional cam pins on several suppressed short machine guns with 20k plus rds over the years is just inspect it then spend the 8 bucks when it wears out.

**markm** · 08-07-20, 08:39

Originally Posted by Pappabear

But I dont understand why flipping them around makes any difference.

It doesn't. PURE NONSENSE!!!

20 plus years on this gun, and this has to be the top 5 dumbest f@cking bullshit I've ever seen.

**ST911** · 08-07-20, 08:58

Keeping an open mind, and I always appreciate a quality technical discussion.

I would be interested in observations and data comparing this directional cam pin practice in GTG vs good-as bolts.