Velocity Precision is known mainly for their triggers. They have introduced some other items lately, One of those is an adjustable gas block for AR15 rifles. If you are looking to tune a suppressed rifle, or just want less strain on your rifle’s parts, an adjustable gas block just might be what you need.

An adjustable gas block can be very useful. By allowing the gas system to be adjusted, one can “tune” the rifle. If you run a low mass bolt carrier group (BCG), adjusting the gas down, will smoothen out the recoil impulse, and not beat the crap out of your equipment. Suppressors are notorious for “over” gassing the recoil system. So tuning the gas block, when running suppressed, is also a big plus. Another advantage to an adjustable gas block is being able to tune your rifle or pistol for the specific ammunition you use. As you can see, there are numerous reasons why someone might want an adjustable gas block.

The Velocity adjustable gas block has many features. It is of the “low profile” design, manufactured from stainless steel, and then black nitride coated. So it should last a lifetime. Velocity also cuts some diamond shapes in the gas block to help lighten it up. The gas block has a 0.750” journal diameter, which is pretty much the industry standard. Though I would like to see a 0.625” one for lightweight builds. The Velocity gas block uses 2 set screws on the bottom to clamp it down tight. Also included is a new gas tube roll pin, which was nice. Since the one that came with the gas tube went flying across my garage. It also comes with the allen wrenches to adjust it.

Adjustment on the gas block is pretty straight forward. On the front of the gas block, is a brass set screw. The brass screw is used as a lock screw, to keep your adjustment from wandering. Loosen it first before making any adjustment on the adjustment screw. The gas adjustment screw is stainless steel, and located on the left side of the gas block. To adjust the gas flow, turn the SS screw clockwise to decrease the amount of gas being sent to the BCG, and turn it counter clockwise to increase the amount of gas to the BCG. Once you have it adjusted where you want it, tighten the brass screw back down. The SS adjustment screw just blocks off flow by making the gas hole smaller, simple as that. If you are switching between suppressed and un-suppressed, the gas block can get annoying to keep adjusting. But, Velocity coats both screws in hi-temp anti-seize for a lifetime of easy adjustability.

I installed the Velocity adjustable gas block on a 7.5” AR pistol build. In my opinion, the shorter the barrel, the harsher the gas system is on the BCG. The barrel I used was not dimpled for a set screw style gas block. So I just lined up the Velocity gas block, and tightened those set screws down. The gas block hasn’t loosened up, or moved, on me yet. I did use some medium strength thread locker on the screws. I opened up the adjustment screw, all the way, at first. The pistol ran fine on an assortment of ammunition. I then proceeded to adjust it in, 1 turn at a time, until it started malfunctioning with the lightest loads that I regularly shoot. Then I backed it out ½ turn and locked it down with the brass screw. I get a much softer recoil impulse now that the gas system is adjusted for the AR pistol. It really did make for a much nicer shooting pistol. The only problem I ran into, was that the allen wrench provided was to short to tighten the lock screw, at least with my chosen handguard. This is not a Velocity Precision problem, it’s a handguard problem. So check your handguard to see if it blocks the adjustment screw.

The Velocity adjustable gas block can be useful. If you need some gas system adjustment, but won’t be adjusting it a lot, this might be exactly what you are looking for. The gas block is well made, fairly light, and won’t break the bank. Go take a look at Velocity Precision, gas blocks aren’t the only thing they make!