Sig 556xi Sig 556 .223/5.56 Bolt, Bolt Carrier with Tromix Oversized Charging Handle. Great Condition. Can be used with Sig 556 or 556 xi models but your charging handle has to be used on right side with 556 model. $360 Shipped 2 Day Priority Mail. Payment by Paypal Discrete friends and family. I have lots of references here on this sight. Private message (start conversation) if interested or have any questions.