AR-15 Steel Gas Block Dimpling Jig (Budget-Friendly Alignment Tool)
Want to dimple your AR-15 barrel exactly 180° from the gas port… without buying a $100+ jig you’ll use twice? Yeah, we thought so.
This simple, no-frills Gas Block Dimpling Jig from Mid State Firearms gets the job done cleanly, accurately, and without draining your ammo budget.
🔧 What It Does (and Why You Actually Need It)
If your barrel doesn’t have a factory dimple, properly aligning your gas block can be a guessing game—and guessing wrong means:
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Misaligned gas system
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Cycling issues
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General frustration and bad words
This tool eliminates the guesswork by giving you a precise drilling guide directly opposite the gas port (180°)—exactly where your set screw needs to lock in.
⚙️ How It Works (3 Easy Steps)
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Slide the jig onto your barrel
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Use the included pointy set screw to center perfectly on the gas port
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Drill a shallow dimple through the guide hole on the opposite side
Done. No voodoo. No measuring. No regret.
🎯 Key Features
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Precision alignment using your existing gas port
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Drill guide positioned at true 180° opposite, 5/32″ drill bit recommended
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Includes pointed set screw for accurate indexing, ensuring it is centered on the gas port.
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Works with most set screw style gas blocks
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Reusable, durable, and refreshingly simple
🤔 Why Only One Dimple?
Because that’s all you need.
Virtually all set screw gas blocks are designed with one screw directly opposite the gas port. This jig helps you place that one critical dimple exactly where it matters—no overthinking required.
🔗 Recommended Pairings
Make the most of your install with quality components:
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Upgrade your setup with a premium AR-15 Bolt Carrier Group
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Browse our full selection of AR-15 Gas Blocks
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Check out complete uppers at AR-15 Upper Receivers
👉 Shop all parts: https://midstatefirearms.com/
👉 Gas blocks: https://midstatefirearms.com/product-category/ar15-ar10/upper-receivers-parts/gas-blocks-systems/
👉 Barrels: AR-15 & AR-10 Rifle Barrels | Midstate Firearms
👉 Complete uppers: https://midstatefirearms.com/product-category/ar15-ar10/upper-receivers-parts/upper-assemblies/
💬 Final Thoughts
Is it fancy? No.
Is it effective? Absolutely.
This is one of those tools that quietly does its job perfectly—like a good gas system should.
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.