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Ar gas issue...i think.

You will need to weigh it and compare to known buffer types and weight. Do a google search for buffer weights which will help you determine what you have. For example a n H-3 buffer is anywhere from 4.8 to 5.4 oz. The link below explains buffers in detail and how they effect the ejection process.
https://www.80percentarms.com/blog/ar15-buffer-weights-what-the-difference-is-and-how-to-choose/

Hopefully this will help. FWIW the buffer you have is a carbine buffer and appears to be a solid buffer meaning it does not contain internal weights. If you shake it and you hear weights move back and forth then it is not a solid buffer.
 
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