Greenhornet-1 is correct. That's a factory Savage Striker stock that I painted.
Now that I've had this gun up and running for better than a year, I've absolutely fallen in love with it. The load I've settled on is a 250gr Sierra MK over 76.5gr of H4350. Recoil isn't bad, somewhere around a stout 44mag load I'd say. I'm getting 2650 fps from the 18" barrel with no pressure signs, and 3 shot 100yard groups in the .3-.4" range. I don't see any reason to mess with this load. I am still considering extending the throat to gain a little powder room, but I'm afraid to mess up what I have going. I don't know that an extra 75-100fps is worth the effort.
I'm still debating on whether to put a higher magnification scope on here, but the VX3L 3.5-10x50 is working so well that I just don't see any reason to change the setup. The gun weighs 7# 8oz as it sits, making it a very portable long range pistol.
Over all I'm very happy with the gun and the caliber. The brass has been holding up very well. I'm getting about 5 full power loads per case before the primer pockets start to feel sloppy. Since the 375 Ruger brass is readily available and reasonably priced around here, this caliber seems like a pretty good alternative to some of the larger 338s.
I ended up chambering a 19" rifle barrel for the 338/375 Ruger and it has made an amazing elk carbine. In fact my Father-in-Law has taken that rifle hostage and won't give it back!!
I would almost say that the 338/375 is a better option than the straight 375 Ruger as a hunting carbine. I still love my Ruger Alaskan though. ;)