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Megaro - I'm not familair with the buffer you are using, but I know some guys recommend using a spacer or a special, longer buffer with the 9mm setup. IIRC a partial roll of quarters works in a pinch. I'm wondering if that will help with the initial recoil impulse.
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I am using this buffer system:
http://www.blitzkriegcomponents.com/mobile/Product.aspx?ProductCode=AR15-AB-9mm
I talked to Brian at nokick.com. He recommended this but said that he was working on a new buffer system similar to the 9mm Silent Captured Spring set they sell, but which is out of stock. I know a lot of people think it is vodoo and not worth the money. But I found that it did smooth things out. I liked it and it was money well spent for me although others may disagree. I have not tried the quarters trick. But I did use the heavy buffers and found that these messed up the cycling on my 9mm, so I discarded them. From what I have read, the recoil impulse is different on a 9mm system because you have a blowback gas system that is pushing a big bolt rearweards and the slamming into the buffer tube is what causes a lot of the push.
I am no expert on this subject at all. But I love to tinker, and even if it is not broken, it is always fun to look for improvements. Sure I have wasted some money, but it is my entertainment. I guess I am always looking for that next best thing in the AR world. I like the looks, simplicity, and function of the retros but with modern internals for the most shooting fun.
I need to try the method CDENMARK recommended, but I didn't follow his description exactly. I am going to send him an IM, get a clarification and try his method next. The Colt 9mm SBR ar15 never went far in the military, and probably because the mp5 was better. But I am married to the AR platform.