For a PDF copy of the DI Gas Block or Piston Kit instructions, please email us at firstname.lastname@example.org or call 727-849-6880.
You can read the installation and adjustment instructions for the DI Gas Block here:
Thank you for purchasing Superlative Arms® products. Now that you have received your patented, adjustable, direct impingement gas block please make sure to follow the steps below:
Make sure the weapon is unloaded by doing the following:
- Make sure the firearm is pointed in a safe direction.
- Remove the magazine and lock the bolt carrier back.
- Place the safety selector in the “SAFE” position.
- Physically and visually inspect the chamber to make sure it is clear.
WARNING | We recommend that a professional gunsmith install all components. Always practice safe firearm handling procedures when using or maintaining firearms. Superlative Arms® is not responsible for damage, injury, or death caused by your own intentional, accidental, or negligent discharge or misuse of the firearm.
for the Superlative Arms Direct Impingement Adjustable Gas Block
- Start with a barreled upper receiver (minus the handguard and muzzle device).
- Attach the appropriate length gas tube (not included) to the block using the 5/64” x 5/16” roll pin (included).
- Carefully slide the gas block towards the barrel shoulder, allowing for a .025” gap between the shoulder and the back of the block (use feeler gauges). This will locate the gas hole in the barrel with the gas hole in the block. The Mil Spec call out from the shoulder to the center of the gas hole is .295” on an AR-15. Some barrels and/or other platforms may have a proprietary gas port location. If you are not sure please contact the barrel manufacturer. This is critical for proper gas hole alignment.
FOR SOLID, SET SCREW GAS BLOCKS
- Visually align the top radius of the gas block with the center of the clover in the upper receiver and proceed to tighten your set screws with the 3/32” Allen wrench provided. Many barrels are pre-dimpled. Superlative Arms gas blocks have a set screw location of .500” from center to center. If the pre-dimpled barrel you have chosen has a different center to center, you may secure the screw closest to the shoulder. Apply medium thread locker to the threads of the set screws and only hand tightening is needed.
FOR CLAMP ON GAS BLOCKS
- Visually align the top radius of the gas block with the center of the clover in the upper receiver and lightly snug your clamping screws with a Torx T-15 wrench provided. Using a torque wrench (inch lbs.), slowly tighten the clamping screws. Not to exceed 30 inch lbs. Thread locker not required.
- Install your handguard to visually verify that the block is centered.
- Proceed to the ADJUSTMENT INSTRUCTIONS below.
using the Superlative Arms Patented “Bleed Off” System
Please read before heading to the range, training, or duty.
NOTE | There are numerous variables that will effect gas pressure such as ammo, gas port diameter, barrel length, gas system length, buffer weight, carrier weight, use of a suppressor, etc. It is imperative to know how your rifle is operating. We recommend using a standard carbine buffer and buffer spring, a standard bolt carrier group, and unsuppressed to dial in your rifle. You can always add specialty components (one at a time), or a suppressor later.
OPTIMIZING YOUR DIRECT IMPINGEMENT SYSTEM:
The Superlative Arms® patented “Bleed Off®” gas block comes to you with the adjustment screw in the closed position (zero pressure). From here you will adjust the gas block utilizing the 3/32” Allen wrench provided. Start by backing out the gas adjustment screw counterclockwise four and a half revolutions or 18 clicks (there are 4 clicks / revolution). This is equal to a non-adjustable gas block at full pressure. A barrel manufacturer will port their barrels for a non-adjustable gas block. From 18 clicks you have 30 more clicks of adjustment you can make before the patented exterior detent mechanism prevents the gas adjustment screw from coming all the way out. This is a reference point so the end user knows this is the last position of adjustment. Do not over torque as this will damage the plunger.
CLICKS OF ADJUSTMENT:
0: Closed (Not recommend to fire closed, you may seize the screw)
1-17: Restrictive Mode (Not recommend, you may seize the screw)
18: Fully Open, Full Pressure (acting like a non-adjustable gas block)
20-48: Bleed Off Mode (Recommended - unsuppressed / suppressed)
Next, load 5 rounds into the rifles magazine using the lowest pressure ammo that you plan to use. Keeping your rifle pointed in a safe direction (down range), insert the magazine and charge the rifle. In a safe manor, fire 5 consecutive rounds at your intended target.
Is your rifle cycling properly? If you are not cycling properly, or not at all, STOP HERE. Please check to make sure you have adjusted the gas adjustment screw out to 4.5 revolutions. If yes, please check the installation of your gas system components. The gas block may be installed incorrectly or another variable may be effecting the operation.
If your rifle is cycling properly, where is your brass ejecting? Where your brass is ejecting can tell you how your system is operating and how to make the correct adjustments.
BRASS EJECTION PATTERN:
For a standard AR-15, if your brass is ejecting between 3-4, your gas system is optimized. For best results, dial it in between 3-3.5 (with usage, your BCG will slow down with carbon build-up mimicking an under gassed system). If your brass is ejecting between 1-2.75, your system is over gassed. If your brass is ejecting between 4 and 6, your system is under gassed. An over/under gassed system can cause failures.
Failures can occur by the speed of the carrier coming back too fast. If you are over gassed, follow these instructions:
Back the adjustment screw out counterclockwise until you bleed off enough pressure to achieve the recommended brass ejection pattern. If you are still over gassed at full bleed off, we recommend using a heavier buffer and/or buffer spring.
Failures can also occur when there is not enough gas pressure to cycle the BCG properly. If you are under gassed, please follow these recommendations:
> Verify that you have followed the installation instructions correctly. Your gas block may be not have proper coverage of the gas hole.
> Try running higher pressure ammo to see if you are marginal.
> Use a lighter buffer and/or buffer spring. If you are running a standard carbine buffer, you can remove/change some of the weight(s) inside the buffer.
> Add more back pressure with a muzzle device or suppressor.
> Check gas port size.
No maintenance required when in Bleed Off® mode. If you plan on shooting in restrictive mode, we highly recommend backing the gas adjustment screw out counterclockwise until it stops and apply a dab of anti-seize to the gas adjustment screw before going into restrictive mode.
> Take notes on your build and the adjustments you made to dial in your rifle from the starting point. This will help when adding or removing a suppressor, and/or changing ammunition.
> When adding new components to your build that effect the operation and cycling, do it one at a time so you can see how your system will react.