Extra Heavy Buffer for Blowback Modern Sporting Rifles

New Frontier Armory, known for their billet modern sporting rifle receivers across a variety of calibers has announced the release of an extra-heavy buffer for AR-type weapons. The extra-heavy buffer is designed for pistol caliber carbines to improve function.

Unlike their semi-automatic big brothers, AR pistol caliber carbines are not gas operated, they are blowback operated. Blowback relies solely on the recoil energy of the cartridge detonation, which in a centerfire loading is actually quite substantial relatively speaking. To ensure that the weapon unlocks only after the pressure has dropped, the weight of the blow-back components must be heavier than the gas-operated rotating bolt weapons.

Since there is no gas block or gas hole to adjust, blowback weapons only have a single item that can be switched out, the buffer. Typical AR buffers are around 3.5 – 6 ounces, depending on the weapons configuration. Often, this is not sufficient, especially for high-power pistol loadings such as +P or 10mm Auto.

The extra-heavy 8 ounce buffer will then pair with the typically heavy pistol caliber carbine bolt/carrier to retard the unlock and due to the heavier weight, reduces the bolt/carrier speed, which can reduce felt recoil.

Retail for the 8 ounce buffer is set at $39.99, available direct from New Frontier Armory. 

Nathan S

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

The above post is my opinion and does not reflect the views of any company or organization.


  • Christian Hedegaard-Schou

    Is it also longer than a standard carbine buffer? That’s another issue with the Colt-pattern 9mm AR’s. The overall length of the bolt in a 9mm is about 3/4″ shorter than an AR15 BCG, due to the lack of separate bolt, and so typically you have too much travel. Colt-pattern 9mm’s have a nasty history of snapping off bolt stops because of this.

    You can solve it with a spring spacer (Spikes makes a nice one), which unfortunately only partly solves the problem since the buffer spring is now compressed more than usual, or you can solve it with a longer buffer.

    • Ergo

      you forgot the quarter trick

  • Okay guys.

    Time for me to go ahead and release my 36oz buffer for +P+ ammo. 50% Osmium, 50% Tungsten. Only $3699.

    • El Duderino

      Perfect for your blowback .440 Corbon carbine!

    • Badwolf

      Only 1000% osmium for me. Go big or go home hahaha

      • I’ve always wanted a kidney in exchange for gun parts!

  • thedonn007

    I have been using a Spikes Tactical 5.4 oz T3 buffer with the Spikes Tactical buffer spacer. I just recently switched it out with a 7.5 oz buffer that looks very similar to the one mentioned above. I have not used it yet, but I am hoping that it tames the recoil in my rifle. I am using a Silencerco Octane 9mm suppressor with 4.5″ ADCO barrel.

  • therealgreenplease

    I wish there was a widely available gas-operated 9mm AR 🙁