Can you be more specific? Which M4 model are you looking at? Do you intend to have a custom M4A1 or have something at the other end of the "High Speed" spectrum, with something like a URX or MRE rail system? Are you looking for reliability, a high rate of fire, or a high fps? I don't know where you're located, which doesn't help for calculating shipping or availability. There's a lot of questions that need to be answered before I can answer yours, unfortunately. However, I would suggest going onto WGC or Redwolfairsoft and building a gun via their shopping cart, starting with a good quality donor such as a TM or G&P or WGC Custom (G&P with different body) and adding what you would like.
Cheers,
Vic.
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