M77 and M77 MKII WEIG-A-TINNY® Style Scope Mount-Our Newest Scope Mount in the Ruger Rifle line. This mount converts the Ruger scope ring attaching points to a WEIG-A-TINNY® Picatinny Weaver style mounting point.
To determine if your rifle is the short action you need to measure from the center of the rear scope ring slot on the top of the receiver to the center of the front scope ring slot. The short action is 4” long, larger readings are the long action.
Accepts all Weaver and Picatinny style rings and accessories.
Available in black or silver, matte anodized finish, weighs 3.1 ounces.
NOTE: Long Action Only The M77L is not suggested for the following caliber power factors
Use this formula. Multiply bullet weight times velocity. If you exceed a power factor of 500,000 the M77L will not hold up. You will need to use our new M77LX mount.
Example: .338 Win Mag.... Bullet weight 200 gr...Velocity 2950 fps..... 200 x 2950=590,000 this exceeds the M77L mount capability the M77LX would be required