Harrell's precision tuner cut to .861" to fit on barrel of CZ 457 MTR, only been attached to gun once, fits perfect, did not fire gun with it on. QqEbMyA.jpg 39.6 KB · Views: 20 h82Pd4B.jpg 24 KB · Views: 4 cnXdGjQ.jpg 42.4 KB · Views: 4