The Luth-AR 11.5 Lightweight Complete Upper Barrel Assembly starts with our 11.5 5.56mm Lightweight barrel made from 4150 Chrome Molly with a 1-9 twist mated to our A3 Flattop receiver which includes our bolt carrier charging handle forward assist and ejection port cover. The upper is then topped off with our lo-profile gas system and our ergonomic 9 Palm Handguard

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