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This will shoot .223 as well as the 5.56? — 2 Answers

by Kev, from FL, United States Asked on June 8, 2020

Name Spikes Tactical M4 Flat Top Upper (4.5)
$115.00 $103.50 Save 10%
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Answered by Armando R., Gear Expert, from IL, United States, on June 16, 2021

Yes. The upper receiver does not determine the exact caliber, that is determined by the internals/barrel. As long as this is built out for a 5.56 NATO or .223 Wylde, it will shoot .223 Remington with no problems.

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Answered by cody, member, from CT, United States, on April 26, 2021

if you build it for 5.56, yes.

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Last updated 2025-11-12 UTC.