Action Enhancement Trigger for SD, SDVE & Sigma

Direct replacement trigger for Smith & Wesson SD, SDVE, and Sigma-series pistols. Eliminates the factory hinged trigger design, replacing it with a solid aluminum shoe that uses a center-mounted pivoting safety blade. Compatible with both standard and hinged-trigger frames. Can be installed standalone or combined with a spring kit for further weight reduction.

Compatibility

• S&W SD9 / SD40
• S&W SD9 VE / SD40 VE
• S&W Sigma 9mm / .40SW (all variants)
• Does NOT fit M&P, M&P Shield, or SW1911 frames

Key Features

• Drop-in replacement – no frame modification required
• 6061 aluminum shoe, hardcoat anodized
• Center-mounted pivoting safety blade – maintains factory passive safety engagement
• Reduces trigger pull weight approximately 10–15% when installed alone
• Reduces pre-travel by 20%
• Reduces over-travel by 10%
• Works with factory trigger bar and sear – no additional parts needed for basic function
• Compatible with aftermarket spring kits (sold separately) for further pull weight reduction

Install Difficulty

2 out of 5 – Moderate. Requires removal of the slide, trigger pin, and trigger bar. Tools needed: 1/16″ punch, small hammer or mallet, slave pin (optional but helpful). No permanent modification to frame or fire control group. Average install time: 20–40 minutes. Armorer-level familiarity with S&W Sigma/SD disassembly recommended.

FAQ

Will this trigger work with a spring kit?

Yes. The trigger is designed to function with or without an aftermarket spring kit. Installing a spring kit alongside this component will further reduce pull weight below the 10–15% baseline. If using a spring kit, verify compatibility with your specific SD/SDVE/Sigma model before assembly.

Does this trigger change the safety characteristics?

No. The center-mounted pivoting safety blade replicates the factory hinged trigger’s safety engagement. The trigger still requires a full, intentional press to disengage the internal striker block. All factory drop-safety values are maintained.

Will this fit my M&P or Shield?

No. This trigger is specifically designed for SD, SDVE, and Sigma frames only. It is not dimensionally compatible with M&P, M&P Shield, or any other S&W pistol platform. Verify your model before ordering.

Ships within one business day. Limited lifetime warranty against defects in material and workmanship. No returns on installed components – inspect fitment before assembly.