So long as you have the RMR plate for it
No, this is the First version.
The 508T is made from titanium
Was not provided with that information recommend reaching out to manufacturer.
Mounting a Holosun HE508T-RD-X2 to a Glock 17 Gen 4 can be done in multiple ways. If you have an MOS (optic ready) model Glock 17, you can use the #2 optic adapter plate included with your Glock. If you do not have an MOS model Glock 17, you can have your slide milled for the RMR footprint by a gunsmith or use a dovetail adapter plate. The correct dovetail adapter plate needed to mount this optic can be found linked below:
https://www.opticsplanet.com/evolution-gun-works-trijicon-rmr-sight-mount-1-780-in-aluminum.html?_iv_gun-model=glock-17
No, the Holosun HE508T-RD-X2 uses the much larger Trijicon RMR footprint. Your P365XL will only fit optics that use the RMSc or K footprint such as the Shield RMSc, Vortex Defender, Holosun EPS Carry, Holosun 407K/507K, Holosun SCS Carry and more.
Yes, the Holosun HE508T-RD-X2 1x 2 MOA Dot Red Dot Sight, as well as all Holosun optics, has been bench tested to handle up to 1000G of recoil.
The Holosun HE508T-RD-X2 Red Dot Sight is not compatible with the Sig P365XL. It uses the larger RMR footprint while the P365XL is cut for optics with the smaller RMSc or K footprint. You can fit optics like the Shield RMSc, Sig Romeo Zero, Holosun EPS Carry, and Holosun 407K/507K.
Yes, The Holosun HE508T-RD-X2 Red Dot Sight will fit Trijicon RMR optic footprints. So with plate #2 included with your Glock 19, you will be able to install this optic.
From what information I could find the Holosun V2 models have been discontinued by Holosun.