Yesterday I took my Bushmaster Varmiter Special SS to the range, it is quite impressive the groups this AR will shoot!
Here is a 15 shot group at 100 yards that can be covered with a dime, this was not using a vice, just a couple of sandbags off the hood of my jeep.
Here is the same group covered with a dime.

This is why I like Bushmasters, and why I have no problem buying a factory built Bushmaster, opposed to building one out of some mismatched parts in order to save a few dollars.
This was shot using, Hornady 40gr. V-max's, Remington cases, CCI Magnum Small Rifle Primers and WC-844 Powder.