AR-15 Gas Block Aligner — Precision Setup Tool for Perfect Gas Port Indexing (SKU 100015041)
Make your next build run right the first time. The AR-15 Gas Block Aligner is a bench-ready tool engineered to help armorers and DIY builders perfectly center the gas block over the barrel’s gas port—preventing short-stroking, over-gassing, and accuracy-robbing inconsistencies. Whether you’re installing a new barrel, swapping to an adjustable gas block, or troubleshooting a cycling issue, SKU 100015041 streamlines the process so you can lock in reliable, repeatable performance.
Why You Need a Gas Block Aligner
Dead-Center Alignment: Precisely indexes the gas block to the barrel port for efficient gas transfer and reliable cycling.
Faster, Smarter Installs: Cuts guesswork and re-do’s; confirm position before torquing set screws or pins.
Better Reliability: A properly centered gas block reduces short-strokes, erratic ejection, and inconsistent lock-back.
Improved Accuracy Potential: Correct gas system timing and alignment help stabilize pressure curves and rifle harmonics.
Works on Most AR-15 Builds: Compatible with popular low-profile blocks and common barrel profiles used in modern free-float setups.
Key Features & Specs
Product: AR-15 Gas Block Aligner
SKU: 100015041
Purpose: Centers and verifies gas block-to-barrel gas port alignment during installation
Compatibility: AR-15 barrels and low-profile gas blocks (set-screw or clamp-on) with standard gas journal sizes*
Use Cases: New builds, barrel swaps, adjustable gas block installations, cycling diagnostics
Construction: Shop-grade materials designed to withstand repeated use at the bench
Finish: Smooth, finish-safe contact surfaces to protect barrel coatings
*Fits most .750" low-profile gas blocks; usability with .625", .875", or .936" journals depends on your specific block and barrel—verify before use.
What It Solves—Common Symptoms of Misalignment
Short-stroking or failure to lock back on an empty magazine
Over-gassing leading to harsh recoil and excessive wear
Inconsistent ejection patterns that complicate diagnostics
Gas leaks from partially covered ports, causing sluggish cycling
Frustrating do-overs after the handguard is already reinstalled
Step-by-Step (Best Practices, Non-Instructional)
Unload & Clear: Separate upper from lower and confirm the chamber is empty.
Prep the Journal: Degrease the barrel gas journal and the inside of the gas block; lightly oil fastener threads.
Initial Positioning: Slide the gas block onto the journal; place the Gas Block Aligner per the tool’s instructions to index the block directly over the barrel port.
Verify Gas Tube Path: Ensure the gas tube moves freely through the barrel nut and upper receiver without binding.
Secure & Torque: Tighten set screws or clamp screws to the block manufacturer’s spec; use threadlocker where recommended.
Function Check: Confirm gas tube alignment, reassemble, and test for proper ejection and hold-open.
Pro Tip: Mark your barrel and block with a fine scribe or paint pen once aligned—future maintenance is quicker and foolproof.
Build Scenarios Where It Excels
Adjustable Gas Blocks for suppressed/unsuppressed tuning (precise alignment is critical for consistent adjustment range).
Lightweight Competition Builds that demand the smoothest recoil impulse and reliable lock-back.
Troubleshooting rifles with erratic ejection, sluggish cycling, or unreliable bolt catch function.
Barrel Upgrades where new contours and handguards change gas system geometry.
Compatibility Notes
Gas System Lengths: Works across pistol, carbine, mid-length, and rifle gas systems—alignment matters on all of them.
Blocks & Journals: Most effective with low-profile blocks; pinned FSBs require different tooling.
Free-Float Rails: Ideal for slim M-LOK rails where gas block access is limited after installation—align perfectly before you button things up.
Care & Maintenance
Keep It Clean: Wipe the tool surfaces after use; remove carbon and threadlocker residue.
Protect Finishes: Check for debris that could scuff nitride, phosphate, or Cerakote barrel finishes.
Store Flat: Keep in a tool tray or bench drawer to maintain shape and ensure repeatable results.
Safety & Legal
Always verify the firearm is unloaded before work.
Follow barrel and gas block manufacturer torque values and threadlocker guidance.
Comply with all local, state, and federal regulations when modifying firearms.
Who It’s For
Home Builders & Hobbyists who want pro-level results without guesswork.
Armorers & Shops standardizing accurate, efficient gas system installs.
Competitors & Enthusiasts seeking maximum reliability and minimal recoil impulse.
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AR-15 Gas Block Aligner (SKU 100015041): the fast, finish-safe way to center your gas block for rock-solid reliability, smoother recoil, and match-grade consistency—so your next build runs right from the very first round.
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