Guntec USA AR-15 Upper Completion Kit With Gen 3 Dust Cover Anodized Red. 223 Remington Gun Make: AR Platform Gun Model: AR-15 Weight: 3 oz Condition: New Features of Guntec USA AR-15 Upper Completion Kit w/ Gen 3 Dust Cover Forward Assist Spring and Pin included Kit Contains Gen 3 Aluminum Dust Cover Gate Recommended For Billet Uppers Only Package Contents: Guntec USA AR-15 Upper Completion Kit w/ Gen 3 Dust Cover What firearm models does the manufacturer say Guntec USA AR-15 Upper Completion Kit w/ Gen 3 Dust Cover is compatible with? The manufacturer suggests that Guntec USA AR-15 Upper Completion Kit w/ Gen 3 Dust Cover is compatible with AR-15Guntec USA 223UPPER-CKIT-G3-RED: AR-15 Upper Completion Kit With Gen 3 Dust Cover Anodized Red