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What calibers can I use with this? — 3 Answers

by member, from VA, United States Asked on October 10, 2020

Name Aero Precision M4E1 Threaded Assembled Upper Receiver (4.8)
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Answered by Kevin, Gear Expert, from IL, United States, on October 20, 2020

This is a 5.56/223 upper receiver which can be used with most pistol calibers, 5.56/.223, and .300 Blackout.

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A
Answered by Chris Kuehl, member, from CO, United States, on April 29, 2021

556/223, 22lr, 300bo, 7.62x39, 9mm, 45acp, .410, 6.5 grendel, I’m sure there are many more too.

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Answered by Fubar24, member, from FL, United States, on October 11, 2021

Also works for 6.8 SPC, in addition to those previously listed.

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Last updated 2025-11-12 UTC.