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A number of .40 USPs have been converted to 10mm as I have read off of the shooters.com BBB. As I recall, the chamber was reamed to 10mm length, and Para .40 caliber magazines were used. Another mag catch cut is required on the mag body, but from what the posters stated, the guns ran 100%. I do not know what pound spring they ran in the gun. These guys were happy with their guns, though. Go to Shooters.com, click talk, and go to handguns. someone should be able to help. Good luck, From the brotherhood of 10mm, DougC
 
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