Slightly used 13.7 barrel from Sons of Liberty. Reason for selling is I rebarreled to a 14.5. This is the FSB version barrel. But I have a low pro gas block and tube to go with it. It ran just fine with the lo pro gas block. No muzzle device. Text me at 210 838 1811
Can also sell as an upper.. have upper receiver and bcm quad rail to finish it out for more $$$