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Q&A for Aero Precision ATLAS AR15 Shim Pack — 2 Questions & 2 Answers

Name Aero Precision ATLAS AR15 Shim Pack (5)
$10.00 $9.99
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Q
Tyler, guest, from WI, United States, asked on April 04, 2026

Are these 1/2" or 5/8" inch

A
Answered by 12BEngineer, member, from ND, United States, on May 01, 2026

The previous answer is incorrect. These are Barrel nut shims for timing the gas tube slots in the barrel nut to match up with the gas tube port in the upper reciever. These are NOT muzzle device timing shims.

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Q
Dylan Lewis, member, from WI, United States, asked on November 02, 2025

What are these for? I’m very new to this and just started to gather parts I may need to build my first couple AR-15s.

A
Answered by SixStringNinja, member, from MI, United States, on January 17, 2026

when your putting something like a muzzle break on, it may need to be oriented correctly. Ports up, for example. These allow you to torque it down at the correct position, along with your crush washer.

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Last updated 2025-11-12 UTC.