Well, I haven't upgraded mine yet at all, and I have a new barrel and some hopup buckings and pcs nubs coming in the mail for my m14.
If you're going for a BA, you could consider a lower power BA with a twist barrel. I expect it to work very well after a few tweaks. I'm also adding a firefly to mine, but I bought it from another guy who replaced most of the internals with ASGI parts, so it should be okay for awhile. I do however want to add an airbrake of some sort or some sorbo pads or something, because the pop after each shot is pretty loud.
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