The TacFire MAR047-B Receiver Buffer Tube Extension Kit is expertly crafted from aircraft-grade aluminum with rolled threading, ensuring durability and strength for your firearm. The buffer tube features a hard coat anodized finish that provides maximum corrosion and wear resistance, enhancing longevity. This comprehensive assembly kit includes a standard buffer spring and a 3 oz carbine buffer, as well as a castle nut and lower Receiver End Plate, making it a complete solution for your build. Designed to fit all Mil-Spec lower receivers, this kit is compatible with most rifles; however, it may require a modified buffer and spring for optimal operation. Upgrade your firearm with the TacFire Buffer Tube Extension Kit to enhance performance and reliability.