FN model 70s only have two screws. I have an extreme weather 7mm-08 that is nothing to write home to mother about in the accuracy dept, especially with any factory ammo I tried, except Barnes Vor-TX. I tried Remington Core lokt, Hornady Superformance, Fed Power shok, Federal premium 140 gr. ballistic tip, all produced groups in the 2.5-3" range. It was insanely frustrating because this was the most expensive, best put together, just plane nicest rifle I own. I wasn't until I tried the 120 gr Vor-TX that it showed it would potentially shoot something. With this ammo, it is pretty consistently a 1 to 1.5" inch rifle. It this rifle that made me start reloading. I now have a 120 gr.Barnes TTSX handload and Sierra 140 grain Pro Hunter handload that both consistently turn in sub 1.5" groups and in a big game rifle, I'm OK with that all day long.