Depends on how the MG conversion was registered. MGs are not rifles, therefore min length does not apply. If the receiver was registered, then the MG reg would apply and no SBR exists. OTOH, if the trigger pack or sear were the registered item, the pack could be removed from the rifle, leaving an SBR. 2 stamps. However, one can "marry" a trigger pack and a rifle together (can't use the pack in a different rifle, so noted in ATF records) and then the combo is considered the MG (one stamp). You can later "divorce" the trigger pack for use in other rifles, but the receiver must either have a 16" bbl installed, or registered as an SBR if the short bbl is retained. HK owners do this all the time, as the most common conversion was a trigger pack or sear. If they own one HK weapon, they get say their "MP5" clone married to the pack. Later, when they acquire several HK rifles they divorce and SBR the original so they can swap it out amongst their several rifles.
Suppressor would need a separate registration and stamp.
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