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The problem is the center part has a counter weight so it wouldn't be able to cycle with the JP specific buffer. You can use a normal buffer and spring combo but you wouldn't get the full benefits. The product comes with a buffer + spring though.
It should work with 300 Blk. Maybe a possibility of a issue with some UNsuppressed Sub-Sonic loads... MAYBE. It’s basically a increased mass carrier with a cut back single fastener gas key and shortened buffer to get a longer stroke with the heavier mass essentially getting the gun closer to the “constant recoil” principal.
Yes it does.
No it does not. This needs the proprietary Surefire H-S buffer and spring.
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