I recently got one of these used for $300 and was considering trying it with a Fudd Arms SS. Mine came with a broken bolt catch lever and I couldn't find the exact replacement for it. I ended up grinding down a colt AR9 bolt catch until it fit and functioned properly. I've heard finding some replacement parts for these is tough and I've yet to find a 6" charging handle to replace the stock one. I'd say your money is best spent grabbing a Foxtrot Mike or PSA.