On the USPSA website look under the NROI tab for the production gun list.
This is what it currently shows for the M&Ps:
M&P 357 Sig Compact 3" (24.7 oz.), M&P 357Sig 4" (28.7 oz.), M&P 40 4" (27.5 oz.), M&P 40 Compact 3" (24.4 oz.), M&P 45 4" (27.9 oz.), M&P 45 Compact 3" (27.3 oz.), M&P 45 Full Size (28.9 oz.), M&P 9 Compact 3" (24.2 oz.), M&P 9L 5" 9mm (28.2 oz.), M&P 9mm 4" (27.2 oz.), M&P Pro series 5" 9mm (29.2 oz.)