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The ODIN Works GB75 is a fixed low profile gas block built to keep your AR-15 gas system running the way it should while staying completely hidden under a free float rail. It slips over a standard .750 barrel journal and locks down with both set screws and an included cross pin, giving you belt-and-suspenders retention that holds its zero on the gas port through heat and recoil. The whole thing is machined from carbon steel and treated with a black nitride finish, so it shrugs off corrosion and wear without adding bulk to your build.
The low profile shape is the whole point here. This block was designed to tuck inside ODIN Works free float forends, and it plays nicely under most other slim aftermarket handguards too. The tapered edges are a nice touch that let it clear skinnier rails that would bind up on a chunkier block. Internal diameter runs 0.7505 to 0.751 inch, which is dialed in to slide over a true .750 gas journal found on plenty of medium, M4, and HBAR profile barrels. It weighs in around 1.95 ounces with the screws and pin, so it keeps things light out near the muzzle where weight matters most.
Installation is straightforward if you have done a gas system before. The block uses .450 set screw spacing and comes with a longer gas tube roll pin than a standard block, which is worth knowing since this one sits a touch thicker around the gas tube and the extra length lets the pin sit flush on both sides. Flat sides make lining it up on the gas tube easy, and once the set screws and pin are torqued down it stays put. As always, confirm your barrel journal actually measures .750 before you order, and pin down your gas system length so your gas tube matches.
For anyone piecing together a clean, snag-free AR build, the GB75 is a no-drama choice that does exactly what a gas block should and then gets out of the way.
The GB75 was built specifically to tuck inside ODIN Works free float forends, and its low profile shape clears most other slim aftermarket rails as well. The tapered edges help it fit under skinnier handguards where a bulkier block might rub or bind. If you are running a tight-tolerance rail, check the inner dimensions against the block just to be safe.
It fits barrels with a true .750 inch gas journal, which is the common size on many medium, M4, and HBAR profile barrels. The internal diameter is held between 0.7505 and 0.751 inch for a snug slide-on fit over that .750 surface. Measure your barrel journal before ordering since gas block sizing has to match exactly.
This is a set screw style block that also uses an included cross pin, so you get two forms of retention working together. That combination keeps the gas port aligned and prevents the block from shifting under heat and recoil. Once the set screws are torqued and the pin is driven in, it stays locked down.
Yes, it ships with the set screws and the cross pin, and ODIN Works includes a longer-than-standard gas tube roll pin so it sits flush on both sides. You will still need your own gas tube in the correct length for your gas system and the basic tools to press the pin and torque the screws. The flat sides make lining it up on the gas tube pretty painless.
| UPC | 856205005032 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GB-75 |
| Color | Black |
| Length | 7.4500 |
| Model | |
| Product Type | Gas Block |
| Style | Low Profile |
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