A M1917 rifle in 30-06. I own one of these, and they're heavy enough to really soak up a lot of the recoil in this chambering. Now I can understand how the big ugly front sight may have gotten there; at one time there was probably some micro-adjustable aperture rear sight that went with it, and it was too much of a chore to pull the front sight once a scope was mounted. But who puts a muzzle brake/flash hider on what's essentially a deer rifle? Did the previous owner weight 90 lbs? Or did he plan on follow-up shots so rapidly placed that muzzle rise was a (paranoid) concern?