Here's what I discovered after removing the Mk 4 from my 338 Lapua and replaced it with a Nightforce. Two of the 8-32 cap screw from the 6 screws Seekins Ring broke off. I barely touch the head of two of the corner screws and they just peeled off. The rifle has a violent recoil inspite of the 16 lb. weight and the massive SSG V-Brake on it's muzzle. The rifle previously ripped apart two IOR scope. The MK4 was the only scope that was able to withstand it's recoil. I ended up replacing all 12 ring screws.
















