I want to build and XM-3ish rifle. Looking for a McMillan A1-3 with M5 DBM and an EFR inlet for an R700 SA, Kelbly Atlas Tactical SA, Zermatt Origin/TL3 SA, or ARC Coup De Grace SA. Anyone selling one or have a line on one in stock for someone who is impatient and doesn't want to wait for one to be made? Only sellers with feedback and verifiable references.