Included is everything you need to assemble your PSA PA10 Stripped Lower Receiver! Palmetto State Armory 2-stage nickel boron trigger Finish: Nickel Boron Type: 2-Stage First Stage Weight: 2.0lbs Second Stage Weight: 2.5lbs Total Pull Weight: 4.5lbs Magpul STR Stock The Magpul STR (Storage/Type Restricted) Carbine Stock - Mil-Spec is a drop-in replacement buttstock for AR15/M4 carbines using Mil-Spec sized receiver extension tubes. A storage-capable version of the CTRA(R), the STR has an improved cheek weld and two water-resistant battery tubes on a compact, reinforced polymer A-frame design. *The AR10 platform does not enjoy a common design between manufacturers. As a result, there can and will be subtle differences in the parts of various manufacturers. For best results, we recommend only using PSA PA-10 components with our upper and lower receivers. We do not recommend using other manufacturer's components, we cannot guarantee PSA parts will fit and function with other AR-10 brands.