SOLD This is a 16” Olympic Arms Stainless Ultra Match Bull Barrel marked SUM 556. It’s possibly brand new, but worst case it’s very lightly used. The barrel is fluted with the standard 1:10 twist. Price includes a gas block with Picatinny rail, gas tube and barrel nut. More info on this barrel can be found here: http://www.olyarms.com/index.php?op...olympic-arms-barrel&catid=7:general-questions More photos of these parts can be found here: https://www.dropbox.com/sh/uljk3a7c0qsckg6/AACxmMJhdi98HODZFbX2ocKOa SOLD Asking $225 Contact me via conversation for details Will consider trades for the following; - Glock 17 Gen 3 or 4 - .223 and 9mm ammo Terms: Cash, PayPal or trades okay. FTF on the west side of Portland or I'll ship to your location.