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 a standard AR-15/AR-10 front sight post into a low-profile gas block, a cost-saving technique for installing free-float handguards. The process involves carefully cutting and grinding the existing FSP, followed by a cold bluing finish. The instruction comes from Mrgunsngear, a recognized firearms expert, offering practical advice for budget-conscious builders.

Quick Summary

Modify your AR-15/AR-10 front sight post into a low-profile gas block to install free-float handguards. This cost-saving DIY technique involves cutting and grinding the FSP, then finishing with cold bluing. Expert instruction from Mrgunsngear ensures a durable, custom solution, saving approximately $30.

Chapters

  1. 00:00Introduction and Project Goal
  2. 00:37Initial Cuts: Bayonet Lug and Sling Swivel
  3. 01:27Cutting the Sight Post
  4. 02:22Shaping and Smoothing
  5. 04:55Finishing the Steel
  6. 06:35Final Assembly and Conclusion

Frequently Asked Questions

How can I convert my AR-15/AR-10 front sight post to a low-profile gas block?

You can modify your existing front sight post (FSP) into a low-profile gas block by carefully cutting off the bayonet lug and sight post using an angle grinder and then shaping it on a bench grinder. Finish with a cold bluing solution or high-temp paint to prevent rust.

What tools are needed to shave an AR-15 front sight post?

Essential tools include an angle grinder for initial cuts, a bench grinder for shaping, safety glasses, gloves, a towel for handling hot parts, rubbing alcohol for cleaning, and a cold bluing product like Birchwood Casey Perma Blue for finishing.

Why would someone modify their AR-15 front sight post instead of buying a new gas block?

Modifying the existing front sight post saves money, typically around $30, compared to purchasing a new low-profile gas block. It also retains the durability of a pinned gas block, which is often preferred over set-screw mounted blocks.

What is the main benefit of converting to a low-profile gas block?

The primary benefit is enabling the installation of free-float handguards that would otherwise not fit over a standard A2-style front sight post. This allows for a cleaner look and potentially improved handguard stability.

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