Laser Bore Sighter

 I mentioned that the laser bore sighter that slides into the muzzle was not useful in my M1A because of the flash hider length,  What arrived today: EZshoot 243 308 Laser Bore Sight Red Dot Boresighter with 3 Batteries.

confirmed what seem to be the case at the range: the scope was aimed many, many MOA right of the impact point.  The device itself is a .308/.243 cartridge with a laser.  It is bright enough that even at about 37 feet, the dot was very bright.  My dumb, I did not think about that it lacks an ON/OFF switch.  You need to load and unload batteries every time.  Still, it works well, cost about $17, and chambers and extracts like a .308 should.