Cannot recommend - Sightmark Laser Bore Sights

Weak, impossible to see, even at 25 yards. Beyond that it's even more useless. Massively over priced for what it is, you're better off just boresighting the old-fashioned way. I tried this in 9mm and .270 and both were so weak as to be not there. The tiny case that comes with it is also a hoke, as the batteries fall right out of the open pocket. To boot, three weeks after I sent it back I'm still waiting on a refund.