How can you convert a Main breaker NQ442L2C panel to Main lug and keep the same MH50 box ?

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Issue:
Convert a MB NQ442L2C Panel to a Main lug keeping the same MH50 box

Product Line:
NQ Panelboards

Environment:
Conduit piped already into MH 50 box

Cause:
Change from Main breaker to Main lug Panelboard after installation of box

Resolution:
1) Remove the Main breaker kit and install a NQALM2 Main lug kit .

2) Install a 12" rail extension NQ12RDE kit to the Mains end of interior, and use the Blank Deadfront provided in the extension kit to cover Main lugs