AEG M4 VN mid caps?
 

Do they still make them?
I found one local source that sells the MAG plastic version at $10 each.

I am wondering if there are metal versions of this mag?

I have 4x G&P metal 110rd VN mags instock.

Are the plastic ones indestructible version like the nice ones

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Er, not at all. I've had plastic vn mags, they're just as brittle as any other plastic mag. I've got one somewhere with a hole shot through it.
Buy plastic if its dirt cheap. Otherwise you're better off getting those G&P mags. I've used them before and had no problems!

Just hopping onto Bigload's thread;

Does anybody know if G&P M16VNs fit and feed properly in VFC M16 magwells? I know that VFC and G&P receivers use different measurements/tolerances and was wondering if that would affect the G&P mags fitting into a VFC receiver as well. Thanks!