Sig Sauer 1451-BSS919C(M): This replacement barrel is for your Sig P320 compact model chambered in 9mm and is 3.9" long. BCA Replacement Barrels for compact Sig P320 or M18 handguns are manufactured by Bear Creek Arsenal in Sanford NC, USA. Our Sig P320 barrels drop right into your P320 or M18 pistol. Enjoy high performance at a low cost with a BCA Sig P320 barrel 4150 Black Nitride Barrel 3.9" length 1:16 Twist 9 MM Caliber Unthreaded Unbranded {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}