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Will this work for a 458 socom fail zero bcg — 3 Answers

by Tone, from NM, United States Asked on June 3, 2020

Name POF USA Roller Cam Pin With Modified Gas Key AR15 .223 RCPK223 (4.9)
$60.00 $57.99 Save $2.01
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A
Answered by Brandon B, Gear Expert, from IL, United States, on August 30, 2021

No it will not as this is made for 5.56

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A
Answered by Eric B, member, from TX, United States, on September 03, 2021

Yes it will. The only difference between the 458 and 556 Bolt Carrier Group is the bolt face diameter and the extractor. The rest of the "458" BCG is simply mil spec 5.56. I regularly use my Tromix 458 bolt in what were originally 5.56 carriers.

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Answered by Greñas, member, from CA, United States, on April 14, 2025

It seems more often than not the "expert" answer is incorrect.

Yes, this will work on any direct gas impingement AR-15 (ie: call common ones). If you have a piston gun, you should get the cam pin only version as you do not need the gas key.

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