That looks sweet! How well does it run with the Sandman? Any issues?
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I have only put less than 20 rounds through it since it just got to NFA jail so my experience with the combo is limited. I ran a mag through a direct thread YHM can about 6 months ago to see if the gun would cycle suppressed and it did with negligible increase in carrier speed. With the Sandman on it was very very hearing safe, impressive especially to my FFL who's seen it all. There was a huge 4 foot flame out the end of the can and a nasty puff of gas in my eye from the back of the receiver which wasn't there on the YHM can. I'm pretty sure I was using different ammo back then so some experimenting is due, because I think this stuff burns a bit slower/hotter. But other than that it cycles great and is exceptionally quiet.
I also sorta wish I had got the Sandman-L rather than the S to tame that flash a little more, but I'll just get an L later and have both. I'm going to try the flash hider end cap and different ammo and if need be locking pieces.
my clone collection so far. all are home built except for the gun that got me into roller lockers and hks in the first place: ptr-91
hk33(yes i know has wrong sight)
mp5 reverse stretch