On the Beretta 92X Performance a thumb rest does not go on a frame mount, as on most pistols. It bolts to the Toni System side mount, which also carries an optic. The two rests on this page are made for that mount.
Right and left hand
The rest sits on the side of the gun where your support thumb lies, so it comes in a right hand version and a left hand version. Choose by the hand that supports, not the hand that shoots.
What it does
Pressing the support thumb against a fixed rest holds the front of the gun down and keeps the hands from shifting. The pistol stays flatter in recoil and the grip is the same on every draw, which is why these rests are popular in Open style setups.
Check your division
Not every division allows a thumb rest. Read your rules before fitting one for a match.
The model page Thumb rests for Beretta 92X Performance lists both rests with the other Performance parts.
Frequently asked questions
Does it need the side mount?
Yes. It attaches only to the Toni System side mount.
Does it fit the standard 92X?
No, only the steel framed Performance models.