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The Luth-AR GB-LP936 is a low-profile gas block sized for the larger .936 gas seat you'll find on bull, target, and heavy varmint barrels. If you've stepped up to a fat-profile barrel in something like 6.5 Grendel, 6.5 Creedmoor, .223, or .308, a standard .750 block simply won't slide on. This is the piece that bridges that gap and keeps your gas system running the way it should.
The low-profile shape is the whole point here. It's kept slim so it can tuck neatly under a free-float handguard with the right inner diameter, letting you run a clean, uninterrupted rail line. Anyone building a precision or long-range upper knows how much cleaner a rifle looks and handles when the gas block disappears beneath the tube. Just double-check your handguard's inside diameter before ordering, since heavier barrels and larger blocks need more clearance than a typical carbine setup.
Installation is straightforward. The block secures with two set screws that thread into the barrel's dimples, plus a roll pin that locks the gas tube in place. On a Luth-AR barrel the set screws sit flush once torqued down, which tells you the tolerances are dialed in. A dab of thread locker on the set screws is smart insurance for a mount that won't budge under heat and recoil.
This one is machined and inspected in the USA, then given a black manganese phosphate finish that shrugs off corrosion and wear through hard, high-round-count use. It's a non-adjustable design, so there's nothing to tune or fuss over. For builders who want a dependable, purpose-built component that just works, the GB-LP936 handles the job without adding weight, bulk, or complication to your build.
It's made for barrels with a .936 diameter at the gas seat, which is common on bull, target, and heavy varmint profiles. If you're running a fat-profile barrel in something like 6.5 Grendel, 6.5 Creedmoor, .223, or .308, this is the block you'll want. Standard M4 and HBAR barrels typically use a .750 block instead, so measure your gas seat before ordering.
The low-profile design is built to tuck under a free-float handguard, but you need enough inner clearance for both the fat barrel and the block. Many handguards with a 1.75-inch inside diameter clear a .936 block without trouble. Always confirm your handguard's inner diameter before your build to avoid contact issues.
It uses two set screws that seat into the barrel's dimples along with a single roll pin to retain the gas tube. On a Luth-AR barrel the set screws sit flush once tightened down. Adding a bit of thread locker on the screws is a good idea to keep everything secure under heat and recoil.
No, this is a fixed, non-adjustable gas block, so there's nothing to tune once it's installed. It's a simple, set-and-forget component meant to deliver reliable gas flow. If you specifically want to fine-tune your gas system, you'd look at an adjustable model instead.
| UPC | 859992007050 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GB-LP936 |
| Model | |
| Product Type | Part |
| Color | Black |
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