Surefire m&p remote switch - SureFire X300 Handgun Weaponlight Remote Tailcap Switch

Overall, a great product, allowing one-handed light activation so your free hand can open doors or guide family members behind you. However, the unit needed to be filed down in order to lock into the slot on the pistol; it absolutely would not fit without this modification.
Pros: SureFire reliability, One-Handed Operation
Cons: Fit Issues

This review was written in the old system and had content requirements that are different than reviews written today.