Read before buying - Magpul CTR/MOE Stock Cheek Riser

This is a great add on, but beware if your stock is not extended fully out, the charging handle WILL not extend fully and hit this. Even fully extended, the charging handle sill hits this, but charges enough to do its job. If you run a half extended stock, pass on this upgrade as you'll have to fully extend your stock every time you pull the charging handle back. Otherwise, it snaps right in and works as described. I have my stock fully extended, so this works perfectly for me.