My example was nicely finished on the outside but a bit rough on the inside. Nevertheless, once I figured out how to disassemble it and clean the underside of the slide grip (there was a lot of dirt and the metal was bone dry.) it functioned quite smoothly. I recommend any new purchaser disassemble it and clean/lube those areas not accessible when fully assembled.
Disassembly (field stripping) is simple. Remove the 3 screws holding the bayo lug/heatshield assembly followed by the smaller screw at the top of the magazine. The mag spring, plug and bayo/heatshield assembly will slide right off.
Next remove the small screw on the right side of the receiver just to the rear of the mag tube/receiver junction. The mag tube screws off.
While I didn't remove the barrel, I'm pretty sure it just screws out like the magazine tube.
All in all a nice repro that comes in under $300. Gotta like the capability of just squeezing the trigger and racking the slide to fire and empty the gun. I guess that's how it got the nickname in WW1.