Q: Last night we received an AR-15 style rifle from Trident Armory. The rifle is an assembled upper and lower. All paperwork shows that the rifle is chambered in 450 Bushmaster. This is not marked anywhere on the gun. The lower receiver is stamped “Multi”. The barrel has no markings on it except some kind of proof mark that reads “FM”. My understanding from the current solution is that “Multi” is only ok if its a receiver only. If the rifle is assembled, then we have to go with the caliber marked on the upper. As there is no caliber marked on the upper, what information should I use for my A&D entry and for the 4473?
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