I was originally planning on buying a complete Bushmaster M4 but then realized I could probably get a better rifle and maybe cheaper buying the lower either complete or stripped and then buying a very good upper and putting them together myself. Just happened upon this forum and read the 4 page thread about if a Bushmaster AR-15 is good or not and now I am questioning the quality of the bushie lower even though i've always heard good things. The one store i've checked so far said a complete lower with adjustable stock (bushie) was $350. Is that good bad average? Any suggestions?