I have three pre-ban Bushmaster lowers. All have been verified by the factory. I have built one as an Diemaco C7A1 LMG clone, and another as a early M4 as made by Bushmaster and in use by "Delta Force"(based on one I saw in Bosnia 1995). I have the third one. At present its made up as a Colt M4A1, but will be changing out the lower to a Colt. Any ideas on what to build it up as? I want to build them all based on non-Colt military prototypes. I thought about doing a SPR clone, but dont know if its worth using the pre-ban lower on since it only has a threaded barrel as an "evil feature". Or I thought about an FN M-16A2/A4 clone, but I could just use these uppers on the C7A1 LMG lower. Any other ideas? How much is a like new "pre-ban" Bushmaster lower worth? I thought about maybe selling it (not right now, please dont ask)to finance the purchase of a pre-ban Colt lower for other Colt based projects. Thanks.