Drop-in P320 magazine that resets the trigger mechanically, adding about half a pound to the pull so you train draws and presses in your own P320 without racking the slide.

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DryFireMag for Sig Sauer P320, Training Magazine, Blaze Orange Base Plate - D-P9-RET
The P320 DryFireMag works differently from the Glock and M&P units in one way worth knowing before you buy. Instead of simulating a fixed 5.5 to 6 pound pull, it adapts to the trigger already in your pistol and adds roughly half a pound on top. A stock P320 stays close to stock, and a tuned competition trigger still feels like a tuned competition trigger with a little more weight behind it. For a shooter who has already spent money on the fire control unit, that is the behavior you want.
The mechanism is the same idea: the magazine catches and resets the trigger so you keep a full firing grip, keep the sights on target, and get a fresh press every time without racking the slide. Fitment covers the bulk of the line, including P320, P320C, Carry, Full, MAX, RX, RXP, the X series, the X5 Legion, the WCG, and the M17 and M18 service pistols. DryFireMag also lists the Flux Raider chassis, which matters if you run a P320 in a brace-equipped chassis and want dry reps from the same platform you carry or compete with.
Check your model against the exclusions before ordering: AXG pistols, the XCarry, 10mm and .45 ACP P320s, and California-compliant guns are not supported. Like every standard DryFireMag it takes no laser cartridge of any kind, so hit feedback has to come from a separate device.
Add the DryFireMag Trigger-Reset Magazine (SIG P320) to your build and see how it enhances your platform.