300 BLK 9" barrel, which buffer to use?


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Old 05-16-2014, 02:05 PM   #1
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Default 300 BLK 9" barrel, which buffer to use?

I am doing a 300 BLK build and have submitted my form 1 to the ATF. I will be putting a 9" barrel with a pistol gas system on it. I was wondering if a regular carbine buffer is good enough or do I have to use the H2 buffer? What are your thoughts?



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Old 05-16-2014, 05:48 PM   #2
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You wont know until you try it is what I have found out . I build my own weights for my buffers to work what that particular upper



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Old 05-16-2014, 05:53 PM   #3
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I've run a H2 in my 9.5" 300 BLK since the get go.

Some people start off running a standard carbine buffer for break-in to make sure every thing functions & it locks back after the last round, then switch to a H2.

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Old 05-17-2014, 11:03 AM   #4
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I think regular would do.

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Old 05-18-2014, 12:40 PM   #5
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A little more research and I was able to answer my own question. This is from AAC's website.

IMPORTANT NOTES:
-The 9" and 12.5" AAC 300BLK Uppers are designed for use with a carbine receiver extension, standard GI Buffer Spring, and an H2 Buffer.



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