Weight 3.9oz / 111g – Coating C-Series Cerakote Flat Dark Earth – Mounts Ships with 1/2×28 direct thread. – Barrel Length No restrictions. – Maintenance Detailed cleaning should be performed every 1000 rounds. – Durability Full-auto rated. – Caliber 22 LR 22 Magnum 5.7 17 HMR – Technology Readiness TR Level 9 Fully developed in production.