The LaRue Tactical MBT-2S AR-15 Trigger is meticulously designed and manufactured to deliver optimal performance, making it the perfect complement to LaRue's line of highly accurate rifles. All major components of the Larue MBT-2S AR-15 trigger are constructed from S7 Tool Steel through precision machining. The result is a trigger that features a glass-smooth, extra-consistent function, while maintaining the rugged durability required for battlefield use. The MBT-2S trigger features a crisp break at 4.5 pounds (2.5-pound first stage, 2-pound second stage) and features a smooth and positive reset. Features: Precision-machined from S7 Tool Steel Exceptionally smooth and consistent trigger operation Ideal for both competition shooting and battlefield use Breaks crisply at 4.5 pounds (2.5-pound first stage, 2-pound second stage) Smooth and positive reset Includes an additional "heavy" trigger spring for a 6-pound pull option Each trigger package includes an additional "heavy" trigger spring, allowing users to increase the pull weight to 6 pounds if desired, enhancing versatility. Proudly made in-house in Texas, USA, the LaRue Tactical MBT-2S AR-15 Trigger is a simple yet effective way to improve the performance of your AR-15. Note: this trigger is compatible only with Small Pin Lower Receivers/.154.