While at a local match I don't think it would be an issue but at a sanctioned match they might not allow a Hi Power with the magazine disconnect removed.
The following modifications are NOT ALLOWED IN ANY
DIVISION unless otherwise specifically mentioned.
A. Compensators of any type including hybrid or ported
B. Add-on weights for a competitive advantage (this includes,
but is not limited to, weighted magazines, tungsten guide rods,
brass magazine wells, weighted grips).
C. Heavy and/or cone style barrels without a barrel bushing.
D. Sights of non-standard configuration (i.e. Ghost rings, Bo-
Mar rib, etc.).
E. Disconnection or disabling of any safety device on any gun.
F. Lights mounted on guns.