Your Browser is Outdated
"g" is the unit given to gravity, which is acceleration (feet per second squared in imperial units). It is "g-force", a term you probably have heard before. Example is that heavy feeling (pressing back in your seat) when you accelerate a car rapidly. For this thermal scope, it is how much acceleration it can handle. A 6 pound AR-15 shooting a 55gr 5.56 out of a 16" barrel produces a little less than 300g's recoil. I haven't stated all the variables used in this calculation for simplicity. So this scope can withstand 4 times the amount of g's the example AR-15 can produce. Hope this helps.
It has a standard RMR footprint for pistol, so you would need to add an RMR plate to your rifle if drilled for one. Most cases shooters with a LPVO use an angled scope mount which has the various footprints drillled in for red dot for close up work.
Not in front, won't work like a clip on thermal. Recommend offset of your main optic.