On there web sight I seen were you have to messure how big the barrel is at the muzzle and 1 or 1 ¹/⁴ inch back from the muzzle.i would check there sight to make sure
They are awesome to work with and I think they will even fix it "once" if you mess up the dimensions. I put one on a Savage 110 in 300 WM. Not the prettiest thing but very effective and relatively inexpensive for the do it yourselfer.