I know you don't want to hear this, but save your money and buy NO laser boresighter- I've had a couple , and you're far better off using a couple of rounds of ammo the old fashioned way- I've had both the spud and chambered varieties, and all it does is put the round on the paper- where on the paper is anyone's guess- better to put your target up at "first crosses line of sight at x yards , see where that group lies, move your dials accordingly, then drop back to 100 and fire again- your lasers need a minimum of 50 or something to "see the target " anyway, and chances are you won't see the dot at any more than 100 anyway- even worse in daylight - I've even used rec-t-fires so called reflective target and I couldn't see it in daylight in red-