Stop Guessing. Start Drilling It Right.
If your .875 barrel doesn’t have a dimple, your gas block alignment is basically a coin flip.
This tool fixes that—fast.
The Cheap Ass .875 Dimpling Jig (V2) from Mid State Firearms uses your actual gas port to guide you, so you can drill a perfect 180° dimple exactly where your set screw needs it.
No measuring. No eyeballing. No “that should be close enough.”
✔ Why This Works (When Guessing Doesn’t)
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Aligns directly off the gas port (the only reference that matters)
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Guides your drill to true 180° opposite
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Ensures your gas block sits straight, secure, and repeatable
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Prevents cycling issues caused by misalignment
⚙️ How It Works (Takes 2 Minutes)
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Slide onto your .875″ barrel
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Use the included pointed set screw to index the gas port
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Tighten it down
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Drill a shallow dimple through the guide hole, 5/32″ Drill bit recommended.
Done. You now have a properly indexed barrel.
🎯 Key Features
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✔ Fits .875” diameter AR-15 barrels
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✔ Uses gas port indexing for precision alignment
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✔ Built-in drill guide at 180° opposite port
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✔ Includes pointed set screw for exact centering
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✔ Works with nearly all set screw gas blocks
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✔ Durable steel construction
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✔ Cheap enough to justify owning—even if you only use it once
🤔 Why Only One Dimple?
Because that’s all you need.
Almost every set screw gas block tightens directly opposite the gas port. This jig helps you place that one critical dimple perfectly—no extra work, no unnecessary steps.
🔥 Perfect For:
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Barrels with no factory dimple
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Budget builds that still need to run right
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Builders who want repeatable, clean installs
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Anyone tired of “close enough”
🔗 Complete Your Setup
Don’t stop halfway—finish the job right:
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Gas Blocks:AR Gas Blocks and Systems | AR 15 Gas Tube for Sale — Mid State Firearms
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Bolt Carrier Groups:AR-15 & AR-10 Rifle Barrels | Midstate Firearms
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Complete Uppers:AR-15 Complete Upper Receivers | Mid State Firearms
- Barrels: AR-15 & AR-10 Rifle Barrels | Midstate Firearms
💬 Final Take
This isn’t a fancy machinist tool.
It’s better—it’s simple, effective, and does exactly what you need without wasting your money.
If you’ve got a .875 barrel and no dimple, this is the fastest way to fix it correctly the first time.
sound of freedom – This was a great set up. I loved being able to customize the set up. Only issue I had was my own fault as a newb to building these. I used a heavy barrel in a slim hand guard. It makes adding attachments tough with clearances. Hoping someday to also get an AR10 from here.