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YHM-9394 -AR15 Gas Block Front Sight w/lug .750 Steel Black
YHM-9394 -AR15 Gas Block Front Sight w/lug .750 Steel Black
YHM-9835A - AR15 Gas Block Front Sight w/Rail .750 Steel Bk
YHM-9394 -AR15 Gas Block Front Sight w/lug .750 Steel Black
YHM-9394 -AR15 Gas Block Front Sight w/lug .750 Steel Black
YHM-9835A - AR15 Gas Block Front Sight w/Rail .750 Steel Bk
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YANKEE HILL MACHINE CO., INC. - AR-15 GAS BLOCK FRONT SIGHT

26 Reviews
Model Number
Brownells #
100002237, 100003174
MFR #
YHM-9394, YHM-9835A
UPC
$134.75 - $159.75
Coupon Code
Purchase Limit Help

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What is the YANKEE HILL MACHINE CO., INC. - AR-15 GAS BLOCK FRONT SIGHT?

Multi-purpose front sight works as a fully functional gas block, plus delivers lifesaving backup when primary optics fail or become hindered by low light or poor weather conditions. Machined, steel body features a spring-loaded pushbutton that locks sight in the deployed position. When not in use, simply depress the button and fold down for an unobstructed view through your optics. Protective ears guard the sight post from blows incurred during duty. Split, barrel clamp design allows easy mounting to standard contour barrels without removal of flash hiders or muzzle brakes. Hex cap screws pull clamping halves tight to barrel for complete sight immobilization when properly tightened. Durable, mil-spec, phosphate finish resists rust and corrosion. YHM-9394 includes bayonet lug and pivoting sling swivel that accepts tactical slings up to 1¼" wide. Rubber coating prevents swivel from rattling and giving away your position while on patrol. YHM-9835A has Picatinny-style under-rail that accepts lights, lasers, and other forward-mounted accessories. No sling swivel.


SPECS: Steel, phosphate-coated finish, dark gray. 1-7?8" (4.8cm) long, 1-3?16" (3cm) wide. Sight Post – 2ј” (5.7cm) high when raised. Fits standard, .750” diameter barrels. YHM-9394 – 6 oz. (170g) weight. YHM-9835A – 7.7 oz. (219 g) weight.


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AR-15 GAS BLOCK FRONT SIGHT REVIEWS

4.8
26 Reviews
5 Stars
77%
4 Stars
23%
3 Stars
0%
2 Stars
0%
1 Stars
0%
Reviews Summary
Customers rave about the YHM Front Sight/Gas Block for its sturdy build and ease of installation. Most users report it functions perfectly without gas leaks and holds zero, making it a reliable upgrade for AR-15s. However, a few mentioned concerns about precise alignment during installation and the need for better locking mechanisms. Overall, great value for the price.
What Reviewers Are Saying
Product Quality
80%
Reviewers frequently highlight the quality and durability of the YHM front sight/gas block, noting its solid construction that withstands heavy use and maintains functionality over time. Many express satisfaction with its performance, claiming no gas leaks or malfunctions, which enhances their shooting experience.
Ease of Installation
70%
Several reviews mention the straightforward installation process, emphasizing that even users with limited gunsmithing skills can effectively install the sight. However, a few note that alignment requires patience and careful attention, as the sight requires proper lining up for optimal performance.
Functionality and Performance
75%
Users praise the functionality of the sight, with many reporting that it holds zero well and operates as intended. The flip-up feature is appreciated, allowing for quick deployment. Some highlight the sight's flexibility as it can work with various rifles and setups, enriching the overall shooting experience.
Value for Money
65%
The general consensus among reviewers is that the YHM front sight/gas block offers excellent value for its price. Many appreciate its dual functionality as both a gas block and flip-up sight, providing cost-effectiveness while meeting quality expectations.
Design and Aesthetics
60%
Many customers comment on the attractive design of the front sight/gas block, noting it integrates well with various setups. Users appreciate that it looks good while also being functional, enhancing the overall appearance of their rifles.
Minor Drawbacks
40%
Some reviews mention minor issues, such as the locking mechanism being a bit stiff, and the need for precise alignment during installation. A couple of users suggested that the design could benefit from additional features like better indexing for alignment stability.
5
gas block
Excellent product, worked flawlessly first time at range...
by CHARLES M. HEATON on November 27, 2025
Verified Purchase
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5
Excellent front sight / gas block
The YHM front sight / gas block is a great. It clamps down securely (you could add LocTite to help the bottom adhere to the barrel) and I've never had a gas leak with it. I don't beat on my guns, but they do get handled and shot a lot, and everything has been fine since the install.
by Chris Morgan on April 25, 2024
Verified Purchase
Was this review helpful? 0
5
Best By Far, Excellent, Durable.
I have this sight on several of my rifles. Easy to install, co-witness with my AimPoint Pro. (Also using the YHM rear BUIS) Easy operation and sight adjustment. I switch between my red dot and the BUIS often to verify zero on a regular basis. Always held true, no signs of wear, still acts like new and it has been on my rifle seems like forever. I have another on order to install on a recently assembled rifle.
by Charly Army on November 20, 2020
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5
Top notch
Easy to install. It will correct barrels that came with a flawed pre drilled / canted FSB or pinned FH. Well made. No functional issues.
by Tux on March 07, 2020
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5
Works great
I mounted this on an Anderson 16 inch barrel. Works great. Take your time, line everything up, you will have no problems.
by Les on January 27, 2016
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View All 26 Reviews
Customer Questions
0 Questions