The spring in the end-cap was too short to come into contact with the AA batteries in the Mini-Maglite. After talking to Lyman Ind. (owner of TacStar) they told me to send in for fix/replacement. After $5.15 shipping cost and a 20 business-day wait, Lyman phoned to say the TacStar Pressure Switch End Caps will NOT work with the "LED" type Mini-Maglite, but will work with a "Xenon" type Mini-Maglite. Lyman are shipping back my TacStar Pressure Switch and I'm about to go out to find a Xenon Mini-Mag.
Cons: Does not work with LED type Mini-Maglite (AA)
This review was written in the old system and had content requirements that are different than reviews written today.