i'm in the market looking for a complete ar15 .223 bottom, and later getting the top matching to the caliber i want to shoot. i'm leaning towards the .450 bushmaster right now. i found a local ffl dealer that can get me a few lower receivers like bushmaster, dpms, armalite, river rock. again i'm leaning more towards the bushmaster bottom receiver. he gave me a quote for the bushy complete bottom minus butt for about $259. any objections or things i should know or think about a different brand? i'll be making the purchase tomorrow if everything goes well.