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Expert Answer
You could use the 5.3oz. V Seven Enhanced Teflon Coated Buffer with a pistol 9mm setup. Typically, 9mm builds will use a buffer that varies from 5.0 - 8.5 oz depending on the specific setup. So the 5.3oz. buffer should work just fine, although I would recommend using the ODIN Works 9mm Adjustable Buffer which will allow you to tune the weight from 5.4oz - 7.4oz to allow you to find the perfect weight for your setup. You can find that buffer using the following link:
https://www.opticsplanet.com/odin-works-9mm-adjustable-buffer.html