AR-15 GAS BLOCK MK12 Reviews & Ratings

Slim, low-profile replacement for factory front sight gas block provides maximum clearance for optics and free-float handguards. Streamlined profile reduces forward weight and improves your rifle’s appearance. Set screws, gas tube mounting pin, and installation instructions included. Mk 12 is an exact copy of the gas manifold on the Mk12 Mod 1 and Mk 18 Mod 1 Special Purpose Rifles used by the U.S. Army and Navy. Made from 416 stainless steel with a tough, wear-resistant black oxide finish, and fits barrels with .750" O.D. Mk 12 Style in natural stainless, has the same low profile as the Mk12 Mod 1 gas manifold, and fits barrels with .875" O.D.

SPECS: 416 stainless steel. Mk 12 fits .750” (19mm) O.D. barrels. Black finish. 1" (25.4mm) long, 7?8" (22.2mm) wide, 1-7?16" (36.5cm) high. Mk 12 Style fits .875” (22.2mm) O.D. barrels. Natural silver finish. 1" (25.4mm) long, 1" wide, 1-7?16" high.

See all of our AR15s and AR15 parts here.

View Product

Write a review

5 Stars

80%

4 Stars

3 Stars

2 Stars

1 Stars

20%

Reviews Summary

The AR-15 GAS BLOCK MK12 is praised for its quality and design suitability for clone builds, particularly the MK12 and MK18. However, some users experienced installation issues due to tight fit specifications, with at least one reviewer receiving a unit that did not fit correctly. Overall, proper installation guidance seems key to positive experiences.

What Reviewers Are Saying

Product Quality

70%

Reviewers consistently highlight the high quality of the AR-15 GAS BLOCK MK12, noting its design and functionality for MK12 and MK18 builds, contributing to overall satisfaction among users.

Fitment Issues

50%

Multiple reviews mention that the gas block is intended to have a tight press fit, which can lead to fitting issues for some users. This aspect is crucial to consider for installation, as it can substantially impact the user experience.

Installation Experience

60%

Proper adherence to installation instructions is emphasized, with users noting that difficulties mainly arise from a lack of understanding of the product's requirements. Those who follow the guidance report successful installations.

Variability in Product Performance

25%

There are mentions of variability in the performance of gas blocks, with at least one user encountering an undersized gas block. This indicates a potential quality control issue or inconsistency within batches.

Sort by Filter by rating

MK12/MK18 Mod1 Clones Need This GB!!!!

Like the others said this is a tight, tight fit, and its MEANT to be. It's designed like that on purpose. But this is a very quality GB and if doing a clone MK12 or MK18 build then this is the one you want.

You will need your A game on this one!

This gas block is a legit piece of kit. If the 1 star review had read the directions he would have discovered that badger states this is a press on fit. I used this on my MK12 project and had no issues. Reading the directions prior to install allowed me to get it in place without any fuss. It is tight and it will need heat to be removed though. The one I received included a stainless looking roll pin for the gas tube.

Clone correct

This gas block is correct for your MK12 Mod 1 clone builds. It looks great and works great! But be aware it will most likely be a tight fit to your barrel, and the instructions even say it should be a press fit. This doesn't mean it won't fit, just that it is meant to keep close, tight tolerances.

Perfect for your MK12 clone

I've installed a few of the Badger MK12 gas blocks with no issues.

Inside diameter was too small!

I purchased this Badger Ordnance MK12 .750 gas black from Brownells and when the customer tried to install it on his barrel, it would not fit due to the fact that the inside diameter was too small, I also tried just to make sure and it was too small and rather than try to file and sand (which we should not have to do, since it is supposed to fit any .750 gas shoulder) the inside so it will fit, I sent it back and sold the customer a titanium gas block which fit perfectly! Could be that I just received a bad one but why take a chance on another one and the hassle of having to send it back also, if it turns out bad, like the first one!

by Doug on June 05, 2016

Verified Purchase

Was this review helpful? 1