just for a little balance here....
dunno who may be aware, but the butt ugly little M-3 was the ~ONLY~ U.S. sub gun to ever pass the Aberdeen Proving Ground "mud, blood and crud" test. it has twin recoil springs on guide rods the bolt rides on. hence, NO contact with the reciever, as in armalite AR-180 and AK 47, but the later has one single recoil spring...kinda hard to stop one up with mung and spooh.
as for accuracy, didja ever shoot an open bolt ingram/MAC in 45 ACP? they aren't made for bench rest shooting. they will fill up a doorway pretty fast with 2X 9mm bullet weights at bad breath ranges though!
my understanding is that valkryie bought out the rights from an outfit in olympia, WA. owned by a woman, can't recall her name or the company, but the sillyvillian version was a closed bolt offering. this would help accuracy, at the sacrifice of additional moving parts. i would prefer one of these to a semi thompson as they weigh in at a "biggest loser" start off point of 13lbs. also, unless one is blessed with a steady hand and a deremel tool for milsurp mags, Kahr magazines are pretty spendy. but the Kahr can be converted for govt mags for about $60.
still, a niche offering. mighty fun but no real practical use. personally, i would look at a a mech-tech 1911 upper over this myself. at least they can have a decent trigger.
see:mechtechsys.com
gunnie