Therefore, if one has a semi-auto HK-91, and an HK-93 converted with an auto sear, and having a barrel less than 16 inches, one may not remove the sear from the HK-93 and put it on the HK-91. That would leave the semi-auto pack from the HK-91, and the receiver/barrel combination from the HK-93; a set of parts for assembling a rifle, and said rifle would have a short barrel, and further not be registered. I think that if one disposed of all trigger packs one had, except the one the sear was in, one could legally swap it between the rifles, without having to register the HK-93 as a SBR. The leftover HK-93 receiver and barrel setup would not be capable of firing a shot, with the parts in the possession of the owner, except with the sear converted pack, and using that on it would be OK. HOWEVER, I think ATF would disagree, would probably claim the resulting half of a gun was an “unservicable” short rifle or some other non- sense, and would prosecute should such an arrangement be attempted. If someone is serious about doing this, they need to ask Technology Branch if they will go along with the reasoning outlined. If they didn’t, one would need to sue, rather than have to fight it in a criminal, rather than civil, context.
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“Shooters Ridge, Ruger 10/22 Rifle Stock with Thumbhole – Realtree Hardwood Camouflage”