How To Shave Your AR-15/AR-10 Front Sight To A Low Profile Gas Block (HD)

Published on January 22, 2013
Duration: 7:41

This guide details how to modify an AR-15/AR-10 standard front sight post into a low-profile gas block, saving money on custom builds. The process involves cutting off the bayonet lug and sling swivel, then carefully grinding the sight post down to a low profile suitable for free-float handguards. Finishing with cold bluing prevents rust and matches the original finish, resulting in a durable, custom solution.

Quick Summary

Convert your AR-15/AR-10 front sight post into a low-profile gas block by cutting off the bayonet lug and sling swivel, then grinding the sight post down. This DIY gunsmithing technique allows for free-float handguard installation and saves money on custom builds.

Chapters

  1. 00:00Intro: Shave AR Front Sight to Low Profile Gas Block
  2. 00:37Step 1: Cut Bayonet Lug & Sling Swivel
  3. 01:27Step 2: Cut Sight Post to Low Profile
  4. 02:22Step 3: Shape & Smooth Gas Block
  5. 04:55Step 4: Finish Steel (Cold Bluing)
  6. 06:35Final Assembly & Benefits

Frequently Asked Questions

How can I make my AR-15/AR-10 compatible with a free-float handguard without buying a new gas block?

You can modify your existing standard front sight post into a low-profile gas block. This involves carefully cutting off the bayonet lug and sling swivel, then grinding the sight post down to a low profile that clears the handguard, saving money on parts.

What tools are needed to shave an AR-15 front sight post into a low-profile gas block?

Essential tools include an angle grinder for initial cuts, a bench grinder for shaping and smoothing, and finishing supplies like Birchwood Casey Perma Blue or high-temp engine paint. Safety glasses and a towel for handling hot parts are also crucial.

What are the key safety considerations when modifying an AR-15 front sight post?

Always wear safety glasses. Be cautious when using power tools like angle and bench grinders. Ensure you don't cut into the gas tube hole, as this will compromise the firearm's function. Handle the part carefully as it gets very hot during grinding.

How do I prevent rust on a modified AR-15 gas block?

After grinding and cleaning the raw steel, apply a cold bluing solution like Birchwood Casey Perma Blue. Multiple applications, with rinsing and drying between coats, will provide a durable finish and prevent rust, matching the original firearm's appearance.

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