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Which version to buy for a 300 blackout and will it support the Oppresure for 300 blackout — 2 Answers

by Greed, from MD, United States Asked on July 29, 2018

Name Strike Industries JCOMP V2 Barrel Muzzle Brake (4.8)
As Low As $43.99 Save Up to 20%
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Answered by Armando R., Gear Expert, from IL, United States, on January 04, 2019

Neither of these models will work for .300 blackout. You will want the J-Comp found here:

https://www.opticsplanet.com/strike-industries-jcomp-type89-japan-233-caliber-compensator.html

This is threaded 5/8x24 so your .300 blackout barrel needs to be threaded to that specification. It will fit the Oppressor as well.

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Answered by pyroxide, member, from KS, United States, on December 23, 2018

For .300 AAC Blackout, you'll likely have a 5/8x24 threading on your barrel rather than the 14-1 LH threads. The 5.56/.223 model is not bored to support a .30 caliber bullet and thus will not work. The Strike Industries Oppressor is compatible with all models of the JCOMP v2.

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Last updated 2025-11-12 UTC.