IPSC Production class does forbid the practice of thumb-cocking the first shot. Appendix D4-17:
Quote:
17. Single-action-only handguns are prohibited. Handguns with external hammers must be fully decocked. First
shot attempted must be double action.
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IDPA, on the other hand, does not clearly forbid thumb-cocking in SSP class, stating only that you must
Quote:
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Begin hammer down for selective DA/SA pistols.
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( '05 rulebook 2. H)