3 LR44
or
3 357 Ray-o-vac
or
3 D357 Duracell
It depends on which Lazier site you have but usually, if it is the button size batteries, they go in FLAT side facing out.
Because of the way the 1377 is designed it is not possible to easily attack a laser sight to the pistol underneath. There are a few custom shops that manufacture a custom breech that is longer than the stock breech. Crosman even offers one. You might be able to attach one there. I've attached a scope to one of the 1377's using Crosman part (459MTC) it a Crosman Airgun intermount for scopes. Click on the link below to see the Crosman accessories.
Green laser sight is used for accuracy in hand guns and rifles. The usefulness of green laser sight is reported to be fifty times brighter than the human eye and more accurate than red laser.
Crosman offers a service to locate repair shops that repair older Crosman airguns. See the link below
The R-76 is NOT scopable so a Red Dot will NOT fit on it.
Crosman offers a free service to locate independent shops that repair older Crosman air guns. See the link below
Crosman still has parts for this rifle. contact Crosman at the link below (Customer service) and order the parts you need.
Laser sight is a small visible-light or infra-red laser used to enhance the targeting of weapon systems. It can for example be mounted parallel to the barrel of a handgun or rifle.
Once you activate the laser sight, basically where the laser is pointed is where the bullet is going to go.
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Ultralase is an opticians company which provides laser operations which can improve your eye sight. These laser operations heal people from bad eye sight.
Check out Eotech. The military uses them. They are a halo sight but you don't need a laser on a AR anyway.