I have two. One on my MX8 OU and one on my Mx15 ... both purchased in 2005, the year that I had both shoulders replaced.
The first year they both worked well but went out of adjustment fairly often. The culprits were the ball bearings. They would "flatspot" and fail to lock. Pat McCarthy always made things good and eventually he found bearings made of better material.
Since then (circa 2007) I have only had to adjust the lock twice and haven't replaced any of the better ball bearings. One of the things I opted to do was to put return springs with greater tension on my MX8. I didn't like the return time while shooting doubles. The greater tension worked and I don't even notice the movement anymore.
Both of my stocks' locks work perfectly and I attribute this invention to allowing me to shoot with sore shoulders. I'd do it all over again.
The first year they both worked well but went out of adjustment fairly often. The culprits were the ball bearings. They would "flatspot" and fail to lock. Pat McCarthy always made things good and eventually he found bearings made of better material.
Since then (circa 2007) I have only had to adjust the lock twice and haven't replaced any of the better ball bearings. One of the things I opted to do was to put return springs with greater tension on my MX8. I didn't like the return time while shooting doubles. The greater tension worked and I don't even notice the movement anymore.
Both of my stocks' locks work perfectly and I attribute this invention to allowing me to shoot with sore shoulders. I'd do it all over again.