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We are now able to offer our CAR-15 SD RDB 9mm barrels separately. Thiese barrels give you an integrally suppressed option for your AR 9 and is for radial delayed blowback BCG's from CMMG. The ported barrel is 4150v and has Black Nitride finish and is 1:10 twist and is threaded M18x1, so it’s compatible with HK MP5SD type suppressors and we recommend the HiTec Arms SD suppressors as they're user serviceable. It’s specifically designed for supersonic 9mm ammo. The ports bleed off gas, slowing the bullet to subsonic speeds so no subsonic ammo is required. The barrel will include 16x2.5mm O-Ring which is recommended for B&T and HK suppressors only. These are in stock. Please allow 2-3 days processing.