USED - Sig Sauer 556 Short Barreled Rifle in 5.56x45. 12in barrel including AAC muzzle device. Fixed position front sight and folding rear sight. This model has the M4 magwell and the folding collapsible Swiss-style stock. Comes with Magpul RVG. Bore looks good - shiny with well-defined rifling, and the bolt carrier group indicates that this weapon has been fired but not a lot. Externally the SBR appears to be in good condition - there's scratches from use in the expected location behind the ejection port, and one screw is missing from the folding stock latch on the railed handguard (does not affect function). This is a very attractive rifle and a great piece of history!