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It should tell you in the model number The Px4 is available in four models: Type C: So-called to be Single-action-only ("Constant Action" - hammer is in half-cocked position). Spurless hammer. No decocker. No safety. Type D: Double-action-only. Spurless hammer. No decocker. No safety. Type F: Single and double-action. Decocker. Manual safety. Type G: Single and double-action. Decocker. No manual safety.

Type C is single action only (C is for constant action) and D is Double Action