Product Description The Armaspec Gen 3 Sound Mitigation Buffer (SMB) is a single-stage, captured, drop-in replacement for a standard AR buffer and spring. It is designed to reduce the noise and friction created when a buffer spring rubs inside the receiver extension (buffer tube), helping deliver smoother and quieter cycling. The SMB system can also reduce felt recoil, and features an adjustable spring weight for tuning performance. This Heavy (H) configuration includes the polymer base guide rod, spring, and buffer, and is made in the USA. Product Highlights Single-stage captured buffer system replaces standard buffer and spring for quick drop-in installation Sound mitigation design helps prevent spring contact with the buffer tube for smoother, quieter operation Heavy (H) configuration with 4.91 oz complete system weight to help tune cycling and recoil impulse Adjustable spring weight for fine-tuning (spring can be trimmed per manufacturer/distributor guidance) Made in the U.S.A. and includes polymer base guide rod, spring, and buffer Specs Brand: Armaspec Product: Sound Mitigation Buffer (SMB), Gen 3 Type: Captured buffer & spring assembly (single-stage), drop-in replacement Buffer Weight: Heavy (H) Actual Weight (Complete System): 4.91 oz Equivalent Buffer Weight: 3.8 oz (reference) Adjustable Spring Weight: Yes Included Components: 1x Polymer Base Guide Rod, 1x Spring, 1x Buffer Country of Manufacture: USA MPN: ARM258-H UPC: 810048492442 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.