The Spikes Tactical 9mm Enhanced Bolt offers versatile compatibility with both Glock and Colt pattern lowers featuring a durable black nitride finish for enhanced corrosion resistance and longevity.Spikes Tactical 9mm Enhanced Bolt (SKU: ST9BG01)Compatible with Glock and Colt pattern lower receiversBlow back design for reliable cyclingBlack nitride finish for durability and corrosion resistanceLaser engraved with ST Spider logoIdeal for AR-9 builds requiring reliable performance and broad lower receiver compatibility this enhanced bolt delivers the quality and versatility expected from Spikes Tactical products.