Only a few didn't. Ones that failed miserably were a Rogak, several Lugers, and a CMP M1 rifle that turned out to have an op rod spring in four pieces. Not all were accurate (I never did figure out how to get either an S&W Sigma 40 or a Colt AA 2000 to hit anything) but they ran OK. So did the M1 when I replaced the spring.
Jim
Jim