Convert your MPA10T-A or MPA10SST-A to a 460 Rowland*
Replace your 45 ACP Upper with a 460 Rowland Upper and fire 460 Rowland Ammo. That’s it. The 45 ACP bolt works with both Uppers. Put the 45 ACP Upper back on and fire 45 ACP Ammo.
*45 ACP Ammo cannot be fired in the 460 Rowland Upper. 460 Rowland Ammo cannot be fired in the 45 Upper.