As long as your eye is not directly exposed to the laser there should be no risk to your vision. During normal use the laser is projected and contained in the unit so your eye is not directly exposed to the laser.
The XPS2 has rear mounted buttons, the EXPS2 has side mounted buttons.
The EOTech XPS2 Holographic Weapon Sight mounts to a standard picatinny rail.
The EOTech XPS2 Holographic Weapon Sight will work with an Zastava M77 if you have a picatinny side mount.
The distance between the magnifier and optic does not matter as long as both the magnifier and optic are sitting at the same height. Because of the gap between the picatinny rails on the M1A 4th Generation Aluminum Scope Mount, you will have to mount the magnifier much further back. This will not be an issue.
The dimensions of the EOTech EXPS2 Holographic 1 MOA Green Dot Sight are 3.8" x 2.3" x 2.9" (96.5 x 58.4 x 73.7 mm).
Models MPN:EXPS2-0GRNOP-KIT1 and MPN:EXPS2-0GRN are EXPS-2 models with a green reticle. Model MPN:XPS2-0GRN is an XPS-2 model with a green reticle.
The EOTech EXPS2 Holographic 1 MOA Green Dot Sight could be mounted to an Airsoft rifle.
Demo models will retain the manufacturers factory warranty. For more information regarding the warranty policy, use the link below:
https://www.eotechinc.com/help-center/warranty-information
Yes, the EOTech EXPS2 Holographic 1 MOA Green Dot Sight has a QD Lever for two of the models listed. The models with the QD Lever are MPN: EXPS2-0GRNOP-KIT1 and MPN: EXPS2-0GRN