[R.F.M.]

Hi all,
Anyone know what the preferred method might be when using a bore sighter ? Magnetic muzzle type or in chamber type ? I own an AR9 pistol , a KelTec P50 5.7x28 caliber and a Glock 19 gen 5 MOS. They’ll all need zeroing. I’m considering this one.

Thanks in advance for any feedback.