Finally got to the range with mine.  The only modification is the installation of a JP single stage trigger and springs.  I was dissapointed, at first, since I was getting 2" groups at 50 yards.  After the first 50 rounds it started to settle down and by the time I had 100 rounds through it I was getting 3/4" 50 yd. groups with Winchester Dynapoints.  I then mounted an Ultradot with a 1" riser and consistantly got 5/8" groups and several under 1/2".  In 500 rounds fired I had only one malfunction.  A spent casing wedged itself between the top of the bolt and the underside of the top of the receiver.  Easily removed with the tip of a penknife.  This thing is a shooter!  

Got home and tore it down.  Not much powder residue for a blowback .22 after 500 rounds.  Had more on my S&W 41 after 50 rounds.+  Residue was easily brushed off with a stiff nylon brush (I had removed the factory lube and lubed it with FP-10 when I got it).  One pass with a bore snake (with the brush removed) and the bore was clean as a whistle.  Some fouling in the chamber remained but was easily removed with a nylon bore brush.

The only critisism I could offer would be the lack of a bolt hold open on the last round.  It shoots as well or better than a DPMS with free floated bull barreled .22 flat top I had but found to be too heavy.

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Thanks for the first definite range accuracy report we've seen on this thing. Sounds like it will hold its own with a DPMS .22 upper! I'm sure many here will be happy to hear this.

My pleasure, Snake45!

got a dpms bull upper and waiting to see who makes high cap mags first.  if bm makes em, i'm getting  theirs