Just make sure you get a name brand or a respectable lower receiver. We carry doublestar and tactical machine lowers. Tactical machine lowers are really good, they are the flat black and they have been sent to many friends at Quantico... Barrels are from ER Shaw and have DSC markings. The upper receivers are of the same forgings used by many of the top brands. Bolt carriers are chrome lined ( bolt area ) and are properly staked. Many configs are made to order by the factory and all uppers are assembled so the only thing you have to do with the kits are to assemble the parts into the lower, pop the pins and you should be GTG.
Hope that answers some questions... send me a E-mail if you have more.
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