Was disappointed when I received the gun and seen there was not an extendable butt stock. Called Sig and was told the newer 522 commando no longer offers that butt stock, although every photo advertising the gun shows an extendable butt stock.The Iron sights that come with gun are pretty cheezy as well. With all that said,it's still a freaking blast to shoot, solid weapon,the real deal, Accurate! (Threw the sights away and put a Primary Arms MD-06 Red Dot on it!) Shoots any and all ammo you stuff in it without faltering.I get a big smile on my face every time I pick it up!