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Everything you ever wanted to know about the AR-15 (but were afraid to ask) FEATURING GREG VESS

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I've got an AR that has a little play between the upper and lower, how concerned should I be? Should I just buy a DPMS and be done with it?
You could use an accu bushing and for the play as far as up and down. Brownells sells little shims specifically made for the front take down pin. Most of the time they are sold out so that should tell you something. I always stipulate that when I am ordering upper and lowers together they check the play at the front take down lug and say if it is excessive they will be getting them right back. Either that or I buy locally so I can check fit. I just don't like it and the fact that they sell " match sets " makes me think their is a reason for them. There is a big stink whether they effect accuracy but if it weren't a problem there would be no such thing as " match sets ".
 
Will it make it more accurate as the name implies?
I don't like slop at all but there is a big argument on whether or not it makes a difference in accuracy. I will not get hooked into that argument again. To me a solid build should be solid and that means no slop anywhere. However there are those out there that don't care about slop. All I know is my bolt guns don't rattle, My lever guns don't rattle and my shotguns don't rattle. Why would I want my AR to rattle.
 
Have you ever messed with the barrel extension? Installation, swap out, any experience at all? I do not here much here.
First off you will need a barrel extension torque tool, a vise, a good torque wrench and a good barrel nut removal tool. The torque tool has a place in one end for a 1/2 inch torque wrench. First you insert the barrel into the receiver, then install the barrel nut, secure the barrel nut with the barrel nut tool. Place the extension torque tool into the upper receiver and torque to spec. That's an over simplification of the process but pretty much sums it up. I am sure there are videos that explain it in length and have hands on video. For some reason my computer won't down load you tube video's or I would have shot you a video link to a install video. torque values range from 100 ft.lbs and up depending on the manufacturer.
 
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