Part #117 the plastic bb chamber seems to be my issue with Ra tech tight bore inner barrel .
I removed part #117 and put everything else back together and the m4 will now shoot and the bb's are no longer being jammed.
As I predicted I have lost all the fps due to gas escaping or the bb's are catching the lip of the inner barrel I'm not sure which.
Reading what Stealthee posted I assumed that he meant to lube part #117 which I have tried with no success, I also tried adding a tiny bit of silicone oil to it and still is jamming the bb's.
I have a replacement part #117 in the mail and hopefully it will solve this issue. I will update my findings but if it dose not work can anyone advise me on the best process to trim the inner chamber with out destroying it.
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