The Spike's Tactical 9mm Enhanced Bolt Carrier Group is designed for reliable performance in AR-style firearms using Glock or Colt pattern lowers. Crafted with a blowback design and finished in black nitride for durability, this bolt ensures smooth cycling and enhanced reliability. It features a laser-engraved ST Spider logo, showcasing its quality craftsmanship. With a weight of just 1.1250 lbs and compact dimensions of 8.75 x 2.50 x 2.50 inches, it is an excellent choice for both enthusiasts and serious users alike. Upgrade your AR firearm with this robust and efficient bolt carrier group for superior functionality and performance.