The mechboxes are nothing fancy. I tend to use stock stuff until it breaks and then buy the nicer stuff.
The black magpul has a pretty much stock CA mechbox with a madbull m120, guarder spring guide and a madbul tightbore.
The FDE has a newer JG mech with CA guts, madbull m120. It didn't seem to line up properly for the flora pin so I left it out, but it works fine.
The CA has a stock CA with a Mystery spring. The're all shooting in the high 3s' (360-400) range. The all have Huangs' mosfets.
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