Mosin Nagant 91/30 Bore Sighter 7,62x54R.
 
Helps to align the sights on your Mosin.
Supplied with batteries (3 required).
 
Note this will fit tightly in your chamber and you need to use a cleaning rod to gently tap it out.
Bolt will not close on this unit.
Do not try and close the bolt with this device in the chamber.