[Snakedriver]

I got one of these recently for my gun box. It seems to have all the necessary parts for a field expedient repair, including an extra firing pin.

They're on backorder right now at Midway, but if you'll sign-up to be notified when they arrive you can get one for a pretty good deal. Some other places have them for almost twice as much.

http://www.midwayusa.com/product/587468/dpms-ultimate-repair-kit-ar-15

 

[Snakedriver]

Yep, the parts are interchangeable among all of the mainstream AR-15's. That's the real beauty of the AR's modular system.

BTW, there's no such thing as a stupid question. That's how you learn.

 

[Snakedriver]

so.. now.. this begs the question... seems like with a mag well converter block to let you use a different magazine.. and a different upper? once could change caliber? or if using a caliber similar enough.. even use the oem mags? I was looking at 300 blackout and thought they looked like they might fit an ar mag..

I'm not solid on all the other calibers for the AR. I think .300 Blackout is the same 5.56 round necked out to .30 caliber, so it fits into the standard AR Mag. I think there are others that will work as well without an adapter in the magwell, but I'm not sure which ones.

Personally, I'd like to have a 9mm AR carbine.