The Soviet copy was the Tu-4Here is a great video shot inside B-29 bomber.
B-29 was great leap in WW2 bomber tech because it had mechanical computer to do the aiming. Interesting fact is that any gunner in the plane was able to point all the bomber's guns at a single enemy aeroplane. No wander B-29 gunner crews managed to shoot close to 1,000 Japanese interceptors. Russians managed to snatch a few and make about 500 copies.
Yeah, I think 60% of Britain's WWII aerial victories against Germans were deceived by Hurricanes, not by Spitfires.