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For USPSA I've used TTI+5 on the 17's and TTI+2 on the 21's over thousands of rounds.

Just for range fun I've stuck a TTI+5 on a 21 and it worked just fine.

Right now I've got a TTI+5 on a 15 rounder for my 320 compact. Why? Just because... lol.
It's currently just a nightstand gun and I didn't have any extra 17's or 21's.

All combinations have worked with no issues.
 
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