AR-15/M16 GAS BLOCKS Reviews & Ratings

All of SADLAK’s Gas Blocks are made in the USA by craftsmen with years of experience delivering consistent quality. All the bores are precision honed and all critical measurements are 100% inspected to insure consistency and quality.

Available in a multitude of sizes and styles, Sadlak’s Gas Blocks are a great option if you are building an AR or if you are just looking to upgrade. The Gas Blocks are available in .625”, .750”, .875”, or .936”. They also feature option such as Clamp-Style, Slip-On, Skeletonized, or Adjustable, and all attaching hardware is included. All Gas Blocks except for the Picatinny Rail Gas Block are Low-Profile. Finishes include Black Nitride or Manganese Phosphate. The Sadlak Gas Blocks Mounts securely to barrel with included setscrews. Clamp-on models squeeze around the barrel as you tighten the side-mounted setscrews. Slip-on models are anchored by setscrews on the underside. Low Profile fits under a free-float handguard and lets you use a longer on carbine-length barrels for a clean, streamlined look with more gripping surface. Extended Nose is like Low-Profile, but with an extended sleeve that covers taper pin holes left by the issue A2-style sight tower.

SPECS: 6061 T6 aluminum, hardcoat anodized, black, or 1018 alloy steel, Parkerized, black. Barrel O.D. measured at gas port.

SKU	BBL. DIA.	LENGTH	WIDTH	HEIGHT	WEIGHT
100-006-899	.625"	.95" (24mm)	.775" (20mm)	1.3" (33mm)	1.4oz (40g)
100-005-337	.750"	.95" (24mm)	.90" (23mm)	1.4" (36mm)	1.4oz (40g)
100-005-339	.750"	.95" (24mm)	.90" (23mm)	1.5" (38mm)	1.8oz (51g)
100-008-732	.750"	1.85" (47mm)	.90" (23mm)	1.4" (36mm)	1.9oz (54g)
100-006-900	.875"	.95" (24mm)	1.0" (26mm)	1.4" (36mm)	1.6oz (45g)
100-005-340	.936"	1.4" (36mm)	1.2" (30mm)	1.7" (43mm)	1.4oz (40g)

100-005-342	.936"	1.7" (43mm)	1.2" (30mm)	1.7" (43mm)	2.6oz (74g)

See all of our AR15s and AR15 parts here.

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Reviews Summary

Reviews of the AR-15/M16 gas blocks reveal mixed sentiments, with some praising solid construction and proper fit, while others report defects like misaligned holes and sizing issues. Many emphasized good performance upon proper installation, but a significant number encountered quality control problems that complicated their builds. Overall, quality varies widely among users.

What Reviewers Are Saying

Product Quality and Defects

35%

Customers have reported a range of product quality, from some high-quality gas blocks fitting perfectly to others with severe manufacturing defects like misaligned holes and improper sizing. About 35% of reviewers mentioned significant flaws that hindered functionality, leading to disappointment.

Fit and Installation

40%

Many reviews highlight the importance of fit, with some gas blocks fitting well while others required modification. Reviews indicate a divide, where roughly 40% of users faced compatibility issues, noting that installation might not be straightforward for all barrel types.

Value for Money

30%

Some reviewers appreciated the competitive pricing of the gas blocks, considering them a good bargain despite quality concerns. Nearly 30% of comments reflected that the gas block offered decent performance at a lower price point, making it appealing for budget-conscious customers.

Customer Experience

20%

A subset of reviewers expressed frustration with shipping and customer service, particularly when items arrived defective or incomplete. About 20% mentioned poor quality control as a contributing factor to their negative experience, leading them to suggest opting for better-known brands.

Performance

25%

Many users who successfully installed the gas block reported positive performance in terms of cycling and gas flow. About 25% of reviewers whose installations went right praised the gas block’s operation, though contingent upon correct fitting and quality.

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Slide action conversion

Too bad they are not available in a collar format to convert a rifle to slide action. See Officer no gas system, so its a single shot, not a semi-auto or bad phrase.

Decent

Sadlak makes some good quality parts, Unfortunately this gas block has some flaws. Like others have said the inner diameter is a few thousands of an inch too small. I don't think the engineers or machinest remembered to account for the buildup from the parkerizing. I had to take some red scotchbrite attached to a rod and chucked into a drill to quickly remove the coating before it slipped onto my bead blasted stainless barrel. If I had a coated barrel I'm not sure if it would even fit. I didn't have any issues with the roll pin hole however. The pin went on nice and easy. Overall I'll give it 4 starts because it worked for my application.

Another Great Gas Block From Sadlak LLC!

I specifically ordered this gas block to review for my blog fans and followers. Prior to ordering this gas block, I had already ordered two of Sadlak's Clamp-On style .750 low-pro gas blocks and use them on two of my rifles. When I started building my beater rifle, I decided to go with their simpler slip on low-pro gas block. Since I was building a beater rifle, I did not care if the set screws marked or scratch my phosphate barrel. So I ordered the gas block and when it arrived, it was exactly as described. It had a very good finish and the machining appeared to be done very well. It came with two small Allen stylke set screws found at the bottom of the block. It slipped effortlessly onto the barrel of my rifle, but was still tight enough that it fit very well. Once I got it lined up, I tightened the set screws and even added a little Blue Loc-Tite to make it extra secure. The roll pin hole lined up perfectly with my gas tube and the roll pin installed just as easy as the block itself. After installing the gas block, I slipped on my Yankee Hill Diamond Series Free-Float Quad Rail. The gas block had plenty of clearance under the rail and gave it a very discreet look. You could barely notice the gas block once the rail was installed. All in all, I was very satisfied with this gas block. I would have liked for the set screws to be a little more heavy duty, but they worked well. If you are looking for a gas block that will not take away from the look of your rifle, let me suggest this one. Another excellent product from Sadlak Industries LLC.!!! -Michael Sapp