Pretty simplistic construction, could make one in a couple of weekends with the works lathe or CNC, only real difficult part would be it latching securely to the front sight post with the spring detent. Will be a fun summer project to try out.
Pretty nifty but not worth 2 grand for a user, a collector yes. If they used better baffle design they could def have had something, but with it being on par with a shoddy solvent trap from bubba on Wish, I see few actually using them other than the collector who has a PE (PEM?) 91/30 that was made prior 1940. I’d love one none the less, WWII sniper accessories are always cool.