Modular Innovation Meets One-Handed Attachment Created for shooters who demand the next level of efficiency and adaptability the Print-X SQD-M .40/10mm seamlessly combines B&Ts signature Reduced Backpressure System (RBS) with a revolutionary Super Quick Disconnect (SQD) tri-lug mount. Whether running a .40 caliber or 10mm firearm (both share the same projectile diameter) the SQD mechanism simply snaps onto your barrel no additional tools or threading required. Remove it just as quickly by pressing the release tab making it one of the fastest tri-lug attachments in the industry.