Apparatus for mounting accessories to guns. Some embodiments provide gun mounts each including a body and a magnet to magnetically couple the mount to the gun. The bodies are shaped and dimensioned to mechanically retain the accessories (which can be flash lights). The magnets are mechanically coupled to the bodies (and can be an integral portion thereof) and cause magnetic fields. Given the shapes and dimensions of the bodies, the positions of the magnets relative to the bodies and relative to the barrels of the guns when the bodies abut the barrels, the magnetic field strengths are within a range sufficient to releasably and magnetically couple the magnets and the barrels. In some embodiments the magnetic field strengths are sufficient to limit the ranges of motion of the mounts relative to the guns during the shock created by firing the gun.