Optimal Length for 300 BLK

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Senior Silent Operator
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Optimal Length for 300 BLK

Post by MMH » Tue Nov 05, 2019 6:04 pm

I will be cutting down my 16” barrel on my 300BLK Sig MPX and permanently installing a shroud to keep the ‘barrel length’ over 16 inches. I will be shooing mostly suppressed & mostly supersonic. I will however shoot some supersonic, where I will want maximum energy/velocity. I know that a 9” barrel is very common, is this the optimal size? What would a 11” barrel gain shooting maximum 150gr. Bullets?

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Silent But Deadly
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Re: Optimal Length for 300 BLK

Post by fishman » Sun Nov 10, 2019 10:19 pm

Longer barrels are quieter. Also, I highly recommend making your gun an SBR instead of don't the shroud. The cost of the shroud will have paid for your sbr stamp.
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293

5.56 form 1:

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