5.1 oz h2.5 weight ar 15 / ar 9 buffer (mid between 4.6oz h2 and 5.6oz h3)
Solid piece, no rattling weights, front shoulder is slightly longer than standard buffer. Fits ar15, ar9
Looking for the perfect balance between an H2 and H3 buffer? Our 5.1 oz H2.5 AR-15 / AR-9 buffer delivers smooth cycling and improved recoil control right in the sweet spot between a 4.6 oz H2 and 5.6 oz H3.
Designed as a solid one-piece buffer (no rattling weights), this unit offers consistent performance and durability for both AR-15 and AR-9 platforms.
🔧 Why Choose a 5.1 oz H2.5 Buffer?
Many rifles run best somewhere between H2 and H3 weights. This 5.1 oz heavy buffer is ideal for:
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Overgassed AR-15 setups
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Suppressed rifles
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Mid-length and carbine gas systems needing smoother cycling
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AR-9 builds requiring additional mass for reliable function
- Aftermarket Triggers and other setups needing a heavier buffer.
By adding weight without going full H3, you get:
✔ Reduced felt recoil
✔ Smoother bolt movement
✔ Improved reliability
✔ Less bolt bounce
✔ Better suppressed performance
🛠 Key Features
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Weight: 5.1 oz (H2.5 equivalent)
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Construction: Solid one-piece design (no internal moving weights)
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Compatible with AR-15 and AR-9 platforms
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Drop-in fit for standard carbine buffer tubes
📐 Specifications
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Platform: AR-15 / AR-9
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Buffer Type: Carbine length
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Weight Class: H2.5
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Material: Solid steel construction
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Rattle-free design
🎯 Ideal For
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Suppressed AR-15 builds
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5.56 NATO carbines
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.300 Blackout setups
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AR-9 pistol caliber carbines
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Builders dialing in gas system performance
If you’re fine-tuning your AR build and need something heavier than an H2 but not quite an H3, this 5.1 oz H2.5 AR buffer is the perfect solution.
Upgrade your recoil system with a dependable, solid-body heavy buffer from MidStateFirearms.com.

sound of freedom – This was a great set up. I loved being able to customize the set up. Only issue I had was my own fault as a newb to building these. I used a heavy barrel in a slim hand guard. It makes adding attachments tough with clearances. Hoping someday to also get an AR10 from here.