Anyone running a Maxim Defense CQB Stock? The one with the custom, cut down JP Silent Capture spring? I need to replace the P.O.S. Ace Socom M4 stock on my 300BLK SBR - hold up to heavy calibers my ASS! I can no longer extend or retract the stock and I shoot 300BLK subs 99% of the time. I heard this stock (Ace) had issues, but the email I sent and got a replied to assured me the stock was redesigned and could handle anything. Uh huh. Sure.

Anyways... I love my JP Spring, and since the Maxim was designed in cohoots with JP it's in the top running position for being the replacement. Anyone have any input on it? Good/bad? I can't find much in the way of reviews on it... I'd love to know if you can swap springs like a standard JP setup, but I never got a reply from either JP or Maxim guys. That's why I'm hesitant...