Which would you rather put a law folder on?

AR15/300blk pistol lower or a glock mag ar9 lower? Both are pistol shockwaved for ease of travel considerations. And I have pistol uppers for .223, 300blk and the ar9.

Whichever has the shortest length upper.

All the same and i have cans for each type.

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4.5" Faxon barrel with ILWT mp5n style 3 lug and 3 lugged form 1 can. Fits backpacks, laptop bags, etc with mag inserted. Unfolded and with can attached it's the same length as my 10.5" 5.56s

the 9mm would require machining the rear of  the bolt to accept the plug that connects the bolt carrier to the buffer... to make up for the distance occupied by the LAW mechanism... not that it is that hard...

my AR9 pistol has a 7 1/2" barrel with flash hider and KAK tube, no brace and is under 25"

Most don't need machining, the weight in most is held in by a roll pin

I looked into a 9mm LAW folder conversion, but my NFA hybrid bolt was solid...my PSA bolts have a roll pinned weight but would still have to be drilled for the connector plug as they are part of the total length of the bolt.. it would be a simple machine process, but I didn't really want to mess up a 9mm bolt experimenting , ..., I was trying for a compact firearm with an over match in hit quality out to 150m and decided that a 5.56 would be a better choice than 9mm....  built a 7.5" (and 10.5") 5.56 instead with the LAW folder and pistol length buffer tube... the 7.5 gave me 2" groups at 100m with a dot... can't see much better than that ..there were a couple of challenges to reduce the muzzle blast and noise but they worked out.... good luck