HK's are the about only line besides the M16 that you can take a legally registered sear/DIAS/LL and use it in mutiple platforms to get select-fire in several calibers.
Easier and cheaper with the M16, though. Just need another upper. Not another receiver, plus the SBR thing once you pull your registered pack out of your short HK94, ... Of course you have some of the same legal crap with the M16 stuff, if your dealing with a DIAS or LL. It's an open-field with a factory M16 or RR.
One thing about the HK, you can get into select-fire .308 with a registered sear-pack. Can't do that with an M16, be it factory, RR, DIAS, or LL.
That's my next move. Got everything collected for my HK-91 except the registered sear in an SEF pack. Still have to put the Knights RAS and Harris bipod on this bad-boy.
Wanted a hi-cap, select-fire 7.62 and this is going to be it. Not a belt-fed, but it'll do. Drum will hold 80 rounds. Plus it'll let me get into an MP-5K (SP89) down the road. No problem swapping the sear-pack between the SP89 (pistol) and HK-91 (20" long-gun).
Should be controllable as hell. Weighs 25-lbs unloaded. Gonna fire this off of the bipod only. Can't hold it to fire from the shoulder. Drum's in the way.
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Other posts are right. You pay premium for the HK stuff and supplies will probably be less and less in the future and hence cost more and more.
AR-15/M-16 stuff will be available forever. It's all made right here.