Spf. as the title states. loaded it twice, so it has 100 rounds though it. it fit my Sig 522 w/o problems. i dont know what other AR style weapons it fits. the cheapest i could find it for is 59 +shipping. this one is yours for 48.00 shipped. payment via paypal gift only. ill do a regular paypal, but add 4%. any ?'s please IM. have no worries, check my feedback!!!