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Armaspec SMB Gen 3 Sound Mitigation Buffer – AR-15 – H2 Weight – ARM268-H2
The Armaspec SMB Gen 3 Sound Mitigation Buffer (ARM268-H2) is a premier performance upgrade designed to eliminate the "cheese grater" harmonic vibration and "twang" common in standard AR-15 buffer systems. In 2026, the SMB remains the go-to solution for shooters who want a quieter, smoother cycling rifle without the high cost of a fully captured spring system. This Gen 3 version features refined internal geometry and a proprietary low-friction coating that ensures the spring moves effortlessly within the buffer tube. The H2 (Heavy) weight configuration is specifically balanced for rifles with shorter gas systems (Carbine or Mid-length) or those running suppressed, helping to slow down the bolt carrier velocity for more reliable extraction and softer felt recoil.
The SMB is a direct drop-in replacement for your standard buffer and spring. It utilizes a single-stage design that keeps the spring from contacting the inner walls of the receiver extension, which is the primary cause of the distracting "sproing" sound heard by the shooter. Constructed from high-strength aerospace polymers and weighted with precision-machined steel, the ARM268-H2 is built to endure high-volume duty and competition use. Because it is a non-captured design, it is compatible with standard buffer retainers, making installation a 30-second process. For the AR-15 enthusiast looking to enhance the "feel" of their rifle while improving cycling consistency, the Armaspec SMB is the definitive upgrade.
Includes: (1) Armaspec SMB Gen 3 Sound Mitigation Buffer (H2 Weight).
Key Features
- Sound Mitigation Technology: Drastically reduces the mechanical noise and vibration felt through the buttstock for a much more pleasant shooting experience.
- H2 Heavy Buffer (4.7 oz): Optimized for suppressed rifles, short-barreled rifles (SBRs), and over-gassed carbine systems to improve dwell time and reliability.
- Gen 3 Refinements: Features an updated guide rod and spring interface for increased durability and even smoother operation than previous generations.
- Direct Drop-In Fit: Works with any standard Mil-Spec or Commercial carbine-length buffer tube without the need for special tools or permanent modifications.
- Improved Follow-Up Shots: By dampening the reciprocal mass, the SMB helps keep the muzzle flatter, allowing for faster, more accurate strings of fire.
- Made in the USA: Precision manufactured in the United States with a lifetime warranty against manufacturer defects.
Product Specifications
- Brand: Armaspec
- Model: SMB (Sound Mitigation Buffer) Gen 3
- Weight Class: H2 (Approx. 4.7 oz)
- Compatibility: AR-15 Carbine Buffer Tubes (Standard 7" Depth)
- Material: High-Strength Polymer & Steel
- Spring Type: Precision Ground Sound Dampened Spring
- Color: Black/Silver
- MPN: ARM268-H2
- UPC: 810048492749
