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The Bootleg Low Profile AR15 Gas Block is one of those parts that does its job quietly and never asks for attention. It sits directly over the gas port on a .750" barrel journal and channels gas from the barrel back through the gas tube to your bolt carrier group, which is what keeps a direct impingement AR running round after round. Because it's a true low-profile block, it tucks completely under free-float handguards and keeps your sight line clean, exactly what you want on a modern build where the rail does the talking.
Material matters a lot on a gas block since it lives in the hottest, dirtiest neighborhood on the rifle. Bootleg machines this one from 4140 chromoly steel and finishes it with a salt bath nitride (SBN) treatment. That nitride process hardens the surface and adds real heat resistance, corrosion protection, and a low-glare matte black look that won't reflect light back at you. It's the same kind of finish you'll find on quality barrels and bolt carriers, so it holds up to sustained fire without complaint.
The .750" inside diameter is the most common journal size in the AR-15 world, so this block drops onto the majority of standard barrels and pairs nicely with slim rails. It secures with set screws and is designed to accept a gas tube pinned in place with a roll pin. If you're chasing the cleanest possible fit, dimpling the barrel for the set screws or pinning the block to the barrel gives you the most secure hold under heat, though plenty of builders run set screws with thread locker and call it good.
Bootleg is built in conjunction with Primary Weapons Systems and has a solid reputation among DIY AR builders for parts that just work. If you're finishing out an upper and want a dependable, low-fuss gas block that stays out of sight, this one earns its spot.
No, this is a fixed non-adjustable gas block. It's built to deliver consistent gas flow from the barrel to the bolt carrier group on a standard setup. If you need to tune gas for a suppressor or specialty load, you'd want a dedicated adjustable block instead.
It has a .750" inside diameter, which is the most common journal size on AR-15 barrels. That makes it compatible with a wide range of standard barrels and slim handguards. Just double check your barrel's gas journal measures .750" before ordering.
The block ships on its own without a gas tube included. It uses set screws to secure it and is designed to accept a gas tube pinned with a roll pin. You'll want a gas tube of the correct length for your gas system and the roll pin to complete the install.
It's machined from 4140 steel and finished with salt bath nitride, which adds hardness along with heat and corrosion resistance. That's the same class of treatment used on quality barrels and carriers. For the most secure hold under sustained fire, many builders dimple the barrel for the set screws or pin the block in place.
| UPC | 861418000378 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BP-AGB |
| Product Type | Gas Block |
| Color | Black |
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