I think its because federal has the armed forces contract and employs precisely the same machines. You could have a similar thing in 7.sixty two x51 M1a things. They may be crimping since it could be the M1A. - In the 1979 case ofUnited States v. Michigan, Decide Noel p. https://franciscojdzjp.tinyblogging.com/the-2-minute-rule-for-federal-primers-75551648