I also put 3 of the Sav-1's in my/our Stevens 200's..Mannnn, WHAT a difference! My Buddy just got back into hunting 2 yrs ago. He was shooting 1 1/2" - 2 1/2" groups @100 yds with his Stevens 270 and using Factory ammo. So, Just with the Rifle Basix installation that I did, he's now shooting 3/4 to 1 1/4 " groups...he loves it!! I found it easy to install...did a few bang/thump tests on a snap cap....no failures at all !!..TWO thumbs up for this product review!!