BCA 9mm conversion barrels for Glock 23 handguns are manufactured by Bear Creek Arsenal in Sanford NC, USA. 9mm conversion barrels allow you to shoot 9x19mm out of a Glock 23 which normally shoots .40 S&W by simply swapping the barrels. Durable and highly accurate, our threaded Glock 23 stainless steel Black Nitride Bear Claw Fluted 9mm conversion barrels are backed by our limited lifetime warranty. 416R Stainless Steel Black Nitride Bear Claw Barrel 1:16 Twist 9 MM Caliber Full Length Threaded Unbranded BCA barrels for Glock 23s are compatible with Glock Gen 1-4 pistols (not Gen-5). Thread Protector sold separtately: https://www.bearcreekarsenal.com/guns-parts/thread-protector.html ALL NFA LAWS APPLY {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}}