I installed the M6 TLI Tactical Laser Illuminator into a Sig Sauer P229, w/picatinny rail. Awesome fitting and performance. No tools required to install. Easy to use and light. A little difficult to uninstall as it's snugged tight onto the rail.
Cons: Difficult to remove once installed
This review was written in the old system and had content requirements that are different than reviews written today.