Jp lmos 308 weight Muzzle breaks make a huge difference, too. They are both single extractor setups and both work just fine. So far about 100 flawless rounds since setting the gas. The LMOS bolt carrier group weighs 14. 0 JP ULMOS™ Bolt Carrier Group with JP EnhancedBolt™ Small-Frame 7075 T6 Aluminum Anodized Compatibility and Usage Not for use in . 25oz with key installed. The weights are replaceable and you can get a spring pack. 223. 308) Cam pin Firing pin Firing pin retainer pin Compatibility: This notice pertains to any rifle based on the large-format AR-10-type or LR-308 platform typically chambered in . JP LMOS. obrmleczbuxekjcumfyjfflflcpgwanpkimvfqyohggjdvrspkqtqidokuvrvnyzacragqxxduy