Years ago, I had my 9mm bolt ramped by Adco as the popular thinking was the factory ramp angle was too severe and may lead to broken trigger pins and some lower receiver issues.
http://www.adcofirearms.com/itemdeta...orynumber=2497
Somewhere in my travels, I was able to pick up a tungsten weight for my bolt and installed it along with the buffer from "Slash" - the increased mass, recoil buffer and spring seems to keep the bolt in battery a bit longer and seems to help with the suppressor - noticed in your videos a bit of 'blast' from the bolt on firing and don't know if this is normal and if the increased mass set up would help keep the bolt in battery a bit longer -
http://www.heavybuffers.com/ar15carbine.html
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