[quote name='Hex']
When you have the bolt in hand, look at it so that you can see the flat part with the sproket-like protusions. This is the bolt face. There should be a plunger looking thing on the left, and a claw on the right, with a hole in the middle. Are there any ring shaped markings around the hole, and if so, are they very pronounced? If they're really pronounced, then you might need a new bolt. Are the sprokets a non-reflective black colour, or shiny and silvery? If they're silvery, then they're worn down and might need replacing. Next look at the firing pin, the long silvery nail-like piece. #2 in the picture. Inspect it to see if there are any cracks, or if the point of the pin is too flat. If it is flat, you might need to replace that. It should be round and somewhat pointy, but not sharp. Also look at all of the components and make sure there aren't any cracks or heavy dings. It may be dirty, but that's okay.
Next:
See that rounded cut inside the upper, towards the front and below the carry handle? That's the ejection port. Take your finger, and turn over the upper (it will still have the barrel and hanguard attached) and run your finger all over the inside to see how dirty it is. Looking inside the reciever after running your finger through, look towards the front of the receiver, and see if there's a small silvery black tube sticking into the assembly, and make sure that isn't bent or anything.
I can't really think of anything else... Just make sure he knows how to take the rifle apart, and have him show you how, and make sure you watch. Ask me any more questons, I'm not sure what else to say. :lol: Study these diagrams, too.
http://ar15.com/content/guides/parts/[/quote]
you're the coolest damn gay horse I've ever seen on a message board, bravo. and thanks for all the info.
I'm saving all this shit so I can study it and what not.. once again, thanks.
edit: not to take up so much GD space w/ pics.