It turns out to be a ban Era late mid to late 90's Bushmaster DCM XM15-E2s with the 20 inch target , A2 upper , counterweight butt stock, according to a ATF , the sn range and prefix placed it a LAR lower before BFI started making their own lowers

I've been looking for a pre ban for some time , just havnt tripped over one yet , the condition of this ban Era was awsome , so I put it on layaway

You are correct , allot of contradicting info , mine is not threaded , absent bayo lug , when I get my greasy fingers on it I will right bushmaster and see if they respond