The LBE Unlimited H3 Recoil Buffer for AR-15 Carbine is a heavy-duty buffer designed to manage bolt carrier group velocity and ensure reliable cycling on rifle platforms with specific barrel and gas system configurations. Built in the USA, this silver aluminum carbine-length buffer comes loaded with three tungsten weights, letting you dial in the exact mass your upper receiver needs to run smoothly with your chosen barrel length, gas port size, and ammunition type.

Proper buffer tuning is often overlooked by shooters, but it's critical for reliability and longevity. Too light a buffer and your BCG runs away from the barrel; too heavy and you risk short-stroking. The H3 is the heaviest in LBE's three-tier lineup—designed for setups that need maximum slowing force. Because buffer weight depends on your unique combination of barrel geometry, gas system length, and load, the H3 works best on rifles with longer barrels or heavier springs. This buffer pairs only with carbine-length buffer tubes, so verify your setup before ordering.

LBE Unlimited earned its reputation building AR parts stateside with precision and practical know-how. The silver aluminum construction is durable and lightweight, and the included tungsten weights sit inside the buffer body, keeping weight where it belongs without adding length or changing how your stock rides. If you're fine-tuning a new upper, running unusual loads, or rebuilding after wear, swapping buffers is one of the quickest ways to dial in that reliable lock-and-go feel.

Key Features

• Heavy recoil buffer (H3 weight class) for AR-15 and M16 platforms
• Three tungsten weights included for tunable mass
• Silver aluminum construction
• Carbine buffer tube length only
• Made in the USA

Specifications

Brand	LBE Unlimited
Product Type	Recoil Buffer
Caliber/Platform	AR-15, M16
Buffer Class	H3 (Heavy)
Buffer Length	Carbine
Weight Material	Tungsten (3 weights included)
Finish	Silver Aluminum
Manufacturer	USA

Frequently Asked Questions

What is the difference between H1, H2, and H3 buffers?

The H-series buffers increase in weight: H1 is the lightest, H2 is medium, and H3 is the heaviest. Choose based on your barrel length, gas port size, gas system length, and ammunition type. Heavier buffers slow the bolt carrier group more, which helps with reliability on setups that cycle too fast or use heavy ammo.

Will this buffer work with my carbine-length AR-15?

The LBE H3 is designed for carbine-length buffer tubes only. Do not use this buffer with mid-length or rifle-length buffer tubes. Verify your buffer tube length before ordering.

What's included with the H3 Recoil Buffer?

The buffer comes with three tungsten weights inside the buffer body. No additional weights or accessories are included.

Can I adjust the weight of this buffer after purchase?

Yes, the three tungsten weights are inside the buffer body and can be accessed and adjusted to tune the overall mass for your specific setup.