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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DO NOT BUY THESE!!! Defective

Imagine putting a build together and it won't cycle due to a defective gas block. Even worse when you attach the Surefire brakes with Rocket. I built 2 rifles and both gas block don't have holes for the gas to pass tough. Its a manufacturers defect. The holes were short of the adjustable screw. Please purchase these.

GARBAGE Zero Quality Control

First off I would rate this a zero if I could, so 1 star it is. I got these in and they looked like a $30 +/- adjustable gas block. I installed the gas tube and then realized that there was no hole to allow gas to travel through the block and into the tube. It was completely sealed so no gas could travel. There is a machine out of wack at that company and zero quality control that allowed that to make it to market. Spend the money and buy a better block. Ergo makes a good one at the same price as this.

Does not fit

Does not fit. Previous reviews state this issue.

1 to 2 thousandths off

Gas block would not fit on my barrel. I had a machinist measure and it was 2 thousandths off. It won't fit. I should have gone with a clamp on I guess.

Not impressed

Paid extra for two day shipping for this "low profile" block so I could finish my AR in time, but this clamp on style was to tall on the bottom and hit on my BCM KMR hand guard. VERY irritating paying extra to get it then paying to send it back for a part that was suppose to be low profile.

Won't fit.

Out of spec. only .745 inside diameter won't fit the brownells .750 barrel.

Very disappointed with this product!

It wouldn't fit on my AR-Stoner barrel. I should have spent a little more and bought a YHM low profile gas glock instead.

Good design poor machining

Ordered this gas block for an AR build. When I received it it looked awesome and I couldn't wait to install. When I went to install the gas tube I found like a customer in another review the roll pin hole was off center on one side. This was very slightly off and just by looking you could not see it. Tried to remove the roll pin and ended up breaking one and bending two of the Brownells roll pin punches. If your going to purchase this check the alignment before installing the roll pin. Other than the roll pin issue fit and finish seem to be very good.