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LEAD TIME: Ships within 2-3 Business Days


There are a ton of gas block options on the market today. While some companies make better components than others & are better at consistently holding very specific tolerances, we have seen some areas in which improvements were needed. So we developed our own gas block, which we call the "Gass Hole".


First lets discuss material in which a gas block is made. Some companies use 17-4PH Steel or a 416 Stainless Steel. These metals have a different thermal expansion rate than the steel Criterion barrels are made from. Our Gass Hole is machined from 4140 Steel. This means as your barrel heats up/expands during use, our gas block is doing the same, at the same rate, ensuring you maintain a solid seal between the block and the barrel. 


Having a solid seal between your barrel and gas block means that the appropriate amount of gas needed to cycle your AR is actually making its way through your gas system. We have seen inconsistent fitment among gas blocks from several manufacturers unfortunately. For example, we could have 10 gas blocks from X company and some fit fairly snug, while some you can spin around the journal like the Wheel of Fortune. A loose fitting gas block can cause a decent sized leak in your gas system. This gas that is leaking never makes back into the system & could lead to cycling issues & reduce the range in ammo quality you can reliably use. 


The inner diameters of our gas blocks have been precision honed to snugly fit the journals of Criterion's CORE Series barrels. With how precisely the Gass Hole fits, you will need to "prep" the surface of your CORE Series barrel. This can easily be done with a Scotch-Brite pad. Barrels are normally phosphate coated and the "thickness" of the coating can varry slightly. Refer to our installation video for details. 


Consistent fitment of gas blocks is one factor that will help us gather more accurate data when tuning URGs/Complete ARs. For example, if we build X number of the same length URGs, they should all (for the most part) utilize the same buffer & spring combo. This will help us save time during the functions check stage after assembly. 


For end users, this may clean up some gas issues you may have experienced with your build, or, allow you to shoot a wider variety in ammo quality (to name a couple examples). 


Who hates stripping soft ass hex screws? We know we do. Our hex screws (provided with our Gass Hole) are made from an alloy steel with an estimated rockwell hardness of C45. Our screws also have a deep hex key pocket, so the provided 3/32 hex is less prone to slip out or cause damage during installation. Basically, we have reduced the likelihood that you will strip these screws (For the love of all that is good, please follow torque spec recommendations, regardless of what you are building). Lastly, our hex screws have a knurled-cup for positive engagement with the mounting surface of the gas block journal.


"Don't be an asshole, use our Gass Hole!"

                                                       - Some Dude



  • Designed for Criterion .625" gas block journals
  • Body Material: 4140 Steel
  • Coating: Magnetite, meets MIL-DTL-13924D Class 1 & AMS 2485L standards
  • Two (x2) 3/32" Hex Screw w/ knurled-cup included (Torque Spec: 26 in/lbs)
  • One (x1) Gas Tube Roll Pin
  • One (x1) 3/32" Allen Wrench included
  • Weight: 1.8 oz.

Ripcord Gas Block; .625

SKU: RIGB-.625
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