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Swapping out a front sight tower for a slim low-profile gas block is one of the easiest ways to modernize an older AR, but a pinned-and-welded muzzle device usually turns that job into a headache. The Yankee Hill Machine Hinged Low Profile Gas Block is built to sidestep that exact problem. Instead of sliding over the muzzle like a standard block, it opens on a hinge and closes around the barrel, then locks down with two clamp screws. That means you can finally ditch the A-frame sight and run a full-length free-float handguard without touching that permanently attached brake or flash hider.
This one shines on carbine-length gas barrels where you want to mount a longer rifle-length forearm. It sets up with a .750 bore diameter, which is the standard journal size on most AR-15 barrels, including M4-profile and HBAR contours. The gas port measures .125, keeping your rifle running the way it was set up to. It is a fixed, non-adjustable block, so it is a clean drop-in for a factory-timed gas system.
Yankee Hill machines this block from 4140 steel and finishes it in black oxide, so it holds up to heat and holds its own on a high round count. Feedback from builders who have run it hard backs that up, with folks calling it a genuine problem-solver for pinned setups that has stayed put through plenty of shooting. At just under 2 ounces, it stays out of the way and tucks neatly under most handguards.
Installation is straightforward. The two clamp screws take a 9/64 Allen wrench, and YHM specs a torque ceiling of 40 inch-pounds so you snug it down without overdoing it. A dab of thread locker on the screws is smart insurance if the rifle sees regular use. Made in the USA and priced to be a sensible upgrade for anyone reworking an older build or refreshing a pinned-and-welded rifle.
Standard gas blocks slide over the muzzle end of the barrel, which is impossible when a muzzle device is pinned and welded in place. This hinged design opens up and closes around the barrel, then clamps shut with two screws. That lets you install it without removing a permanently attached brake or flash hider.
It is made for barrels with a .750 gas journal, which is the most common size on AR-15 barrels including M4-profile and HBAR contours. Measure your barrel at the gas block seat to confirm before ordering. It is intended for carbine-length gas systems where you want to run a longer rifle-length handguard.
The two clamp screws use a 9/64 Allen wrench. Yankee Hill specs a maximum of 40 inch-pounds of torque, so a torque wrench helps you get it right without over-tightening. A little thread locker on the screws is a good idea if the rifle gets regular use.
No, this is a fixed low-profile gas block with a .125 gas port. It is designed to run a factory-timed gas system as intended rather than let you tune gas flow. If you want adjustability, you would want to look at an adjustable model instead.
| UPC | 841812100416 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | YHM-9345 |
| Color | Black |
| Model | |
| Product Type | Gas Block |
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