Parts for your LAR-15 we recommend you replace at intervals of 5000 rounds. Includes: 1 gas tube roll pin, 1 gas tube, 1 firing pin retaining pin, 3 gas rings, 1 extractor spring, 1 extractor spring insert, 1 ejector pin, 1 ejector spring, 1 firing pin, 1 cam pin, 1 extractor, 1 extractor pin, 1 action spring, 1 trigger spring, 1 hammer spring