Product Description The Wilson Combat Tactical Trigger Unit (TTU) TRTTUM2 is a match-quality, drop-in two-stage trigger designed to upgrade AR-15 pattern rifles with a clean, consistent pull and a fast, positive reset for quicker follow-up shots. Engineered for durability and reliability, it features precision-machined internal geometry to support dependable ignition across a wide range of ammunition, and incorporates a 1911-style half-cock notch to help meet or exceed military-style drop-safety expectations. The pre-assembled, CNC-machined trigger housing and quality heat-treated components are built for trouble-free installation using standard USGI-style .154" trigger pins in most AR-style lower receivers. Product Highlights Drop-in, pre-assembled Wilson Combat TTU for fast installation in AR-pattern lower receivers Two-stage curved trigger with a 4.04.5 lb pull range for improved control and precision Ultra-crisp break with reduced, positive trigger reset to support faster follow-up shots Precision hammer geometry designed to enhance reliable ignition with military/surplus ammunition 1911-style half-cock notch and robust construction designed for hard-use reliability Specs Brand: Wilson Combat Manufacturer Part Number: TRTTUM2 UPC: 874218005146 Platform: AR-15 / AR-pattern rifles (standard USGI-style lowers) Trigger Type: Tactical Trigger Unit (drop-in cassette style) Trigger Stage: Two-stage Trigger Shoe: Curved Trigger Pull Weight: 4.04.5 lb (approx.) Pin Compatibility: Standard GI trigger pins, .154" diameter Construction: CNC-machined housing with heat-treated steel components; stainless steel spring Caliber Compatibility (per manufacturer guidance): Functions in standard AR-style lowers regardless of caliber, including 7.62/.308 length AR receivers Known Incompatibilities/Notes (per manufacturer guidance): Not compatible with Colt commercial lowers using .169" pins (commonly 19912009), Colt rifles with pinned-in sear blocks, or the Bushmaster ACR; S&W MP-10 requires removal of the ambidextrous bolt catch to install Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.