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TR, I know what you mean by having a heavy bolt the M3 grease gun comes to mind. I had the oportunity to speak with a person that was designing SMGs and he gave me some insight on the timing issues involved with blow back designs. My plan is to incorporate existing parts from certain designs and modify or make what I need to fill in the gaps. Bolt weight is an issue unless you use a roller system in conjustion with a pnuematic rate reducing setup. This lets reduce bolt weight and maintain your timing. Keeping the out of battery operation from happening. Doing this setup allows you to also shorten bolt travel and shorten the firearm. I don't have a nice animation system to check my idea simulated. Your insight is helpful thanks.
I also have another idea in using a hopper as the feed mechanism rather then belts, but the problem with that is getting the rnds situated correctly and that would be hard on the run and gun.
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