The APEX Duty/Carry Action Enhancement Kit (DCAEK) was designed to provide the M&P (9 mm, .357 Sig,.40 and 45ACP) pistol owner a smooth, consistent 5 - 5.5 lb trigger pull with the advantages of shorter over-travel and reduced reset. The kit includes:
APEX Hard Sear
APEX M&P Ultimate Striker Block Kit (USB kit)
APEX M&P Increased Rate Sear Spring** (very small) & Trigger Return Spring
**PLEASE NOTE: the Sear Spring works for non-MA compliant pistols.