Have used one with the ati montecarlo , it adds round 1 1/2-2 inches to the butt, which made it just right for me, and the hand grip is really nice almost pistol grip length and angle. My only criticism is that it adds a bit more weight to what is already a fatty than a wooden stock does. If your adding optics the cheek piece raises your eye to the correct height, but I found using the iron sights it booted my cheek a bit too much.
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