The Police Bookshelf and the Lethal Force Institute, (LFI) are both run by Massad Ayoob, widely recognized as an expert in the use of firearms for self-defense and law enforcement.
The Police Bookshelf carries books by Ayoob, John Farnam, Paxton Quigley, Bill Jordan, John Peters, and others. It also carries videos (including some from Ayoob's LFI classes), Second Chance vests, holsters, and other items related to self-defense.
Their address is: