The Maxim Defense CQB buffer and spring in the H3 weight is the 4.85-ounce tuning option for rifles and pistols running a Maxim CQB stock or brace, the compact systems that use their own shortened buffer rather than a standard carbine buffer (brand part no. MXM47567). It is tungsten weighted, which is how Maxim packs 4.85 ounces into a buffer short enough to fit the CQB tube. Stepping up to H3 slows the bolt carrier, tames bolt bounce and lengthens dwell time, the changes that settle an over-gassed or suppressed 5.56 gun. The matched spring is included, so the set installs as a pair. Maxim Defense makes it for its own CQB systems only; it is not a replacement for a standard carbine buffer.

Key Specifications

• The weight class is H3, the heaviest of Maxim’s rifle-caliber CQB buffer options.
• It weighs 4.85 ounces, well above a standard carbine buffer.
• The weight comes from tungsten, dense enough to reach that mass in the CQB’s short buffer length.
• It fits Maxim Defense CQB stock and brace systems only, not a standard AR buffer tube.
• The matched buffer spring is included, so the set installs as a unit.
• It sits above Maxim’s S at 3.3 ounces, H1 at 4.0 ounces and H2 at 4.65 ounces, with a separate 7.65-ounce pistol buffer for 9mm.

Frequently Asked Questions

Will this fit a standard AR-15 buffer tube? No. It is built to the shortened length of the Maxim Defense CQB stock and brace systems and is only for those systems.

What does the H3 weight change? The heavier mass slows the bolt carrier, reduces bolt bounce and increases dwell time, which smooths an over-gassed or suppressed 5.56 rifle and can improve extraction.

When should I pick H3 over H2? When the gun is over-gassed, suppressed or running hot ammunition and still cycles hard with the H2. Maxim’s lighter S and H1 weights suit softer-gassed setups.

Buy the Maxim Defense CQB Buffer and Spring, H3 4.85 oz

A CQB-equipped rifle that runs hot or suppressed is asking for more buffer mass, and this is the heaviest one Maxim makes for it. Order it with our other AR buffer system parts from our Lubbock, Texas gun shop for fast direct shipping.