Yes, it has the same footprint as the 507c and the RMR.
Yes it will and your irons will co-witness seeing you have the tactical model with suppressor sights.
The body is made of Titanium vs aluminum. Any other differences will be in the electronics and impossible to determine. Optic will not disappoint!!!
I own 4 Holosun red dot sights and all my mounts are great. I ordered this sight also and can’t wait to get it. Even look up the torture tests for Holosun sights.
Yes, it will fit a PPQ Q5 Match, but will require the use of the Trijicon RMR mounting plate for the slide.
                        The mount is only listed as being a picatinny mount which means the recoil lug on the mount will likely be too wide to fit a weaver slot. You would need a weaver mount for this red dot, but luckily the HE508T uses standard Trijicon RMR mounts, so you could use something like MPN: AC32006 found here:
https://www.opticsplanet.com/trijicon-low-weaver-rail-mount-for-rmr-sights.html
                    
                        If your Glock is not milled to accept a red dot or doesn't have a place to mount a red dot, then there is no way to mount it. A standard Glock will require an adapter that replaces the rear sight with an adapter plate. You can use MPN:49513 found here:
https://www.opticsplanet.com/evolution-gun-works-trijicon-rmr-sight-mount-1-780-in-aluminum.html
                    
                        No, this shares the Trijicon RMR footprint and will not fit a Hellcat. The Springfield Hellcat OSP will only accommodate the following red dots out of the box:
J.P. Enterprises JPoint
Shield Sights RMSc
Sig Sauer Romeo Zero
                    
The HE508T has a glass window.
The V2 will have its own listing as it will have a different part number and is physically different.