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In all reality, it would likely just be one stamp,
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Quote History Quoted:
In all reality, it would likely just be one stamp,
I agree with you there.
It's likely that if you already have a SBR AR (lower) you could just install the .50 upper on it...
OR register the .50 upper (since it's a Title I firearm by default) as a SBR and then install it on any lower.
but then the completed assembly would be married.
No it wouldn't be.
It would just be one SBR.
Nothing is keeping it from going back to how it was previously.
If you want to divorce, you'd then have to file for a 2nd SBR for the lower similar to HK sears and host.
That isn't exactly how it works...
If you have a registered legacy HK conversion device (sear or pack/housing) then you can remove it from the host at any time, and use it in any host that it fits in (or
was designed for, I should say, per ATF).
The host just can't be reassembled with a stock
and a short barrel at the same time. It can stay disassembled, or (if it didn't start out as a rifle) you could reassemble it as a Title I pistol while the MG is elsewhere (like in another host).
The "married" HK conversion devices were typically improper registrations to begin with, and some can be "divorced" by registering the original host as a SBR, but others are stuck together forever. It just depends on how wrongly the conversion/registration was done. That's usually what people are referring to when they discuss "divorcing" an HK sear, but sometimes they are simply referring to registering a host as a SBR so it can retain the short barrel and stock without the MG present.