That is exactly what I did , and how I know fitting may and probably will be required. If you aren't confident in taking a file/dremel to your sear maybe avoid. I've been trying to find out if there is a geometry change between the sear and xtreme sear most say no on is just more polished up than the other so a dremel with buffing head and some metal polish...though it goes without saying if replacing the sear or hammer get news ones of both at the same time. I was told after I bought it that the bolo interuptor is for double action pistols (read USPSA production division where they can play with stuff that IPSC can't). The problem with second hand standard guns especially 2011's is that they are typically owned by guys that have been around the block and have thrashed them.
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