Hmmm. I'll bump my offer up to $325.
My Shadow has north of 50K rounds thru it without any such problem.
It has lost accuracy a couple of times.
1. Rear sight was cracked and moved up/down while cycling. I couldnt figure out why my elevation wasnt consistant.
Then it broke off, I replaced it, accuracy returned.
2. During a practice session, the gun wouldnt shoot a group...and had malfunction after malfunction. I field stripped it and as I did, the slide stop came out in pieces. Replaced the part, and no problems since.
I dont think your gun is shot out. You have lots of options. I'll bet Stuart fixes you up. I'd get together with Burningsquirrels if you guys are local to each other. If it were mine, I'd take it to Matt Mink.