$19.75
182 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The Yankee Hill Machine YHM-9383 is one of those parts that just works, which is why it has been a go-to on AR builds for years. It replaces the standard A-frame front sight with a slim, streamlined block so you can slide a longer free-float handguard over a shorter barrel without the sight tower getting in the way. Machined from 4140 steel and coated in a mil-spec black phosphate finish, it is a rugged, no-drama piece that holds up to real use. It sits at 0.95 inches long, weighs about 1.6 ounces, and carries a 0.125 inch gas port with a .750 inch bore to match standard .750 barrel journals on AR-15 and LR-308 platforms.
The low-profile shape is the whole point here. A traditional front sight base blocks you from running modern extended handguards, so swapping to this block opens up your rail options and lets you mount optics, lights, and grips wherever you want them. YHM has a long track record with these blocks, and builders who have run them across dozens of rifles tend to report the same thing: they go on, they line up, and they stay put.
This is the set screw version, which mounts using a pair of Allen-head screws that thread down onto the barrel. It is a beginner-friendly install that does not require permanent modification, and it makes future swaps easy if you decide to change things down the road. For the most secure hold, most builders dimple the barrel so the screws seat into a positive detent, then lock everything down with blue thread locker. Take a minute to align the block's gas port with the port in your barrel using an alignment tool or pick, and you will have a leak-free setup that runs reliably round after round.
Made in the USA, the YHM-9383 is a straightforward, affordable upgrade for anyone building or refreshing an AR and wanting that clean, modern handguard look.
This block has a .750 inch bore, so it is made to fit barrels with a standard .750 inch gas journal, which covers most AR-15 and many LR-308 barrels. Measure your barrel at the gas block seat before ordering to be sure. If your barrel has a larger journal, you would need a different size block.
Dimpling is not strictly required, but it is strongly recommended for a set screw block like this one. A dimple gives the set screws a positive seat so they cannot walk out or let the block rotate under recoil. Pair that with blue thread locker and you will have a rock-solid, leak-free install.
Yes, the set screw design makes this one of the more beginner-friendly gas block installs and it does not require permanent modification to the barrel. The main things to get right are aligning the block's gas port with your barrel's gas port and torquing the screws down with thread locker. Basic tools like Allen wrenches and an alignment pick are all you really need.
The YHM-9383 is the set screw version, which uses two screws that thread down onto the barrel and benefits from a dimpled barrel. YHM also offers a pinch screw variant that clamps around the barrel and does not require dimpling. Set screw blocks are the most common style and tend to have a slightly slimmer footprint for tighter handguards.
| UPC | 816701013573 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | YHM-9383 |
| Color | Black |
| Length | 4.7000 |
| Model | |
| Product Type | Gas Block |
You must be logged in to post a review.
Reviews
There are no reviews yet.