The JPGS-12D2 is a standout component in our D2 series gas block collection, specifically designed for .875 diameter barrels. This ultra-compact gas block is engineered to seamlessly fit beneath nearly any handguard available, ensuring minimal weight addition to your firearm's barrel. The D2 series introduces an innovative forward-facing adjustment mechanism, strategically designed to eliminate access issues with handguards. This cutting-edge adjustment system not only excels in resisting dirt and fouling but also enhances precision by doubling the adjustment clicks per rotation, allowing for exceptionally finely-tuned gas control. The two-piece construction of the JPGS-12D2 simplifies installation, even on barrels equipped with pin-and-weld muzzle treatments, making it a versatile and User-friendly choice for firearm enthusiasts seeking optimal performance and ease of use. The D2 series features a streamlined design, specifically engineered to fit neatly beneath even the most slender handguards with a top rail, such as those in our M-LOK series The reduced dimensions accommodate shorter gas block journals, such as those found on proof barrels, ensuring an optimal fit The external detent mechanism on the nut improves resistance to dirt and carbon buildup, while the durable 5/32 drive facilitates the application of higher torque to effectively overcome and expel fouling The adjustment nut is equipped with a 5/32 inches hex drive and slots, allowing for versatile customization using various tools, such as screwdrivers and knives The D2 series adds an insignificant weight of only 2.5 oz The D2 series features 52 adjustment clicks from fully open to fully closed, effectively doubling the number of adjustment clicks compared to our existing detent blocks This makes them particularly suitable for short-barreled rifles (SBRS) and other barrels with high pressure and short dwell time