Cleaned my gun today, found small unidentifiable pin

[gravitywell]

I've had my remington 870 for a little over a month. After shooting, I did a basic clean and lube of just the barrel. After shooting tonight, I disassembled it to clean it a bit more. When I removed the forend and the breech bolt, a small pin appeared on the floor beneath me. I'm not 100% sure it came from the shotgun, but I don't want to take chances. The pin is about 3mm long, it has a broad head, a broader middle section, and then a thinner pin bottom. The thinner part is minorly longer than the other two sections, the other two sections are about the same size (by eye guesstimation).

I've scoured the net for breech bolt assembly instructions, but I don't see anything, anywhere that resembles this pin. I can send you pics via email or cell phone, if my poor description isn't good enough.

Thank you guys, for everything. Until I find this answer, I guess the rem870 isn't getting use.

[PRegner]

That looks like it may be the detent pin that holds the magazine end cap, and keeps it from unscrewing. It probably came out of the round lug on the barrel that the magazine tube passes through. You should start looking around for the spring as well.

[gravitywell]

You, my new best friend, saved me a trip to the gunsmith and probably a big bill. Lol. The spring was still in-place, as soon as i took off the magazine cap, I saw the screw nestled away. I reinserted the pin, turned it tight, and back together she went.

Thank you very much sir.

[PRegner]

I'm happy to be of help.

[rdsmith3]

That same thing fell out of mine. I have not replaced it yet.