Nikon m308. I’ve used this on bolt guns very successfully and it works great on my m&p 10 .308 w/18” barrel flawlessly. My ‘10 only has a Limb saver on the stock (factory stock) and a Magpul front hand guard for mounting a bipod. Otherwise stock shoots like a dream. Just like my m&p 15 PSX (factory piston m&p 15) completely stock except aftermarket carrying handle and front sight (I’m an iron-sight Marine from the 80’s and using them brings back memories!)
