JP Enterprises AR-15 Silent Captured Spring Gen 2 Features The Gen 2 AR-15 Silent Captured Spring introduces an aluminum guide rod that cuts overall system weight compared to previous versions while maintaining the structural integrity needed for reliable long-term function across thousands of cycles. Three stainless steel weights are included with the H1 configuration providing the appropriate buffering mass profile for standard and low mass bolt carrier setups on semi-automatic .223/5.56 .300 BLK and compatible larger caliber platforms running 14.5 to 20-inch barrels. Full correspondence between JP Enterprises SCS masses and H1 H2 and H3 buffer designations gives shooters a clear and consistent tuning reference when adjusting mass configuration and interchangeable buffers allow conversion between AR-15 and AR-10 models for shooters running both platforms. The drop-in design requires no permanent modifications to the host rifle and fits both M4-style collapsible stock buffer tubes and using the included spacer the longer tubes used with fixed rifle stocks making the AR-15 Silent Captured Spring Gen 2 compatible with virtually any AR-15 platform configuration. The Auxiliary Spring Rate Kit compatibility allows shooters to further optimize cycling performance by swapping the default spring for one of five calibrated spring rates particularly useful on rifles without an adjustable gas block where gas tuning is not an option. The combination of the custom-ground buffer spring and JP Enterprises LMOS buffer eliminates the characteristic metallic noise of conventional buffer springs delivering a noticeably smoother and quieter cycling experience that shooters immediately recognize on the first round fired. JP Enterprises AR-15 Silent Captured Spring Gen 2 Specifications Manufacturer: JP Enterprises Model: AR-15 Silent Captured Spring Gen 2 Buffer Version: H1 Weights Included: Three Stainless Steel Guide Rod: Aluminum Includes: Carbine and Rifle Length Spacer Compatible Buffer Tubes: Carbine Length and Rifle Length Recommended Calibers: .223/5.56 or Smaller .300 BLK Supersonic or Suppressed Subsonic 6.5 Grendel or Larger with Low Mass Bolt Carrier and Adjustable Gas Block Recommended Use: Duty and Competition Rifles Standard or Low Mass Bolt Carriers 14.5-20 Barrels Semi-Auto Platform: AR-15