LBE Unlimited
LBE Unlimited makes US-made AR-15 small parts and build components — gas blocks, gas tubes, buffer tubes, recoil springs, and complete Ready Build Kits — giving home builders and armorers a dependable source for the individual pieces that go into a finished AR-15. The lineup also extends beyond the AR platform with a Glock magazine floorplate removal tool and an AK/SKS sight adjustment tool.
Read our full LBE Unlimited Buying Guide ↓
Gas Blocks and Gas Tubes: Matching Length to Your Build
LBE's low-profile gas blocks are available paired with carbine, mid, and rifle-length gas tubes, letting builders match gas system length to their specific barrel length and handguard clearance. A low-profile gas block sits under a free-float handguard rather than requiring a front sight post, the standard approach on most modern AR-15 builds. Confirm your handguard's inner diameter clears the gas block before ordering.
Recoil Buffers and Springs: H1, H2, and H3 Explained
LBE's ARBUFF buffers come in H1, H2, and H3 weights — progressively heavier tungsten-weighted buffers that slow the bolt carrier's cyclic rate, which matters most for suppressed builds or shorter-barrel guns running higher port pressure. A standard carbine buffer works fine for most 16” direct-impingement builds; H2 or H3 buffers are worth considering for suppressed or short-barrel configurations where cycling can feel harsh with a standard buffer.
Ready Build Kits: A Shortcut to a Complete Upper
LBE's Ready Build Kits bundle a barrel (available in lengths like 7.5” and 12.5”) with the matched gas system components needed to build a complete upper, saving builders from sourcing each part separately and verifying compatibility themselves. This is a practical option for builders who want a dependable, pre-matched foundation rather than assembling a barrel and gas system from separate vendors.
Bolt Carrier Group and Field Repair Parts
LBE's Bolt Carrier Group Gas Key and Bolt Refurbish & Field Repair Kit give builders and owners a way to service or rebuild a worn bolt carrier group rather than replacing the whole assembly, while the Extreme Field Repair Kit and AR-15 Essentials Kit bundle common spare parts for range bags or armorer kits. These are practical for anyone maintaining multiple ARs or running a rifle hard enough to need spare small parts on hand.
Frequently Asked Questions: LBE Unlimited
What buffer weight should I use for a suppressed AR-15?
H2 or H3 buffers are commonly used on suppressed builds to slow the cyclic rate and reduce the harsher cycling that increased port pressure from a suppressor can cause, though the right weight depends on your specific gas system and ammunition.
What's included in an LBE Ready Build Kit?
A barrel matched with the gas system components (gas block and gas tube) needed to build a complete upper, saving builders from sourcing and verifying compatibility between separate parts.
Does LBE Unlimited make anything besides AR-15 parts?
Yes — LBE also offers a Glock magazine floorplate removal tool and a wind/elevation adjustment tool for AK/SKS sights.
See Also: AR-15 Parts • Muzzle Devices