Breaking in my Springfield M1A rifle (civilian M14). Equipped with Smith Enterprise USCG muzzle brake, ARMS #18 Scope mount (Nikon Monarch 3X9X40 scope not shown) and Karsten adjustable cheek piece. I have since bought birch and walnut stocks in addition to this synthetic one (I prefer the wood). The muzzle brake reduces felt recoil 25-30% and muzzle rise by nearly 100%. I've fired over 200 rounds in a day with no shoulder soreness with it at all.