Just my obligatory +1 for PSA. Built my rifle with one of their rifle kits. Great trigger from the LPK, upper is a dream come true. 16" barrel, chrome lined 1:7, low pro gas block, MI T15 rail, properly staked bolt carrier, and the peace of mind that comes with knowing they do MP/HP testing. Can't say I have a bad thing to say about their product, if only they could hire some people to answer their damn phones.