No, there is not enough available rail space on the Springfield XD Sub-Compact model to accommodate this light.
This is meant to attach to picatinny rail not the M-lok system.
No, this requires a picatinny rail, the SW9VE has a proprietary rail system.
This Streamlight Rail-Mounted Weaponlight is too large and will not have adequate rail space to properly mount to the Hellcat RDP. I would recommend using the Streamlight TLR-6 Tactical LED Weapon Light for Springfield Hellcat, or the Streamlight TLR-8 G Sub for Hellcat. Both options can be found linked below:
https://www.opticsplanet.com/streamlight-69287-tlr-6-weapon-light-handgun-springfield-hellcat-led-100-lumens.html
https://www.opticsplanet.com/streamlight-tlr-8-g-sub-for-hellcat-led-weapon-light-w-green-laser.html
The Streamlight TLR-1 C4 LED Rail-Mounted Weapon Flashlight will mount to picatinny rail. So it will mount to both those firearms.
Yes, the Streamlight Rail-Mounted Weapon Tactical Flashlight will mount to the picatinny rail system found on the Sig 516 and function as intended.
The Steamlight Model TLR-1s has user programmable Strobe function.
Yes, the Streamlight Rail-Mounted Weapon Tactical Flashlight is compatible with the M&P M2.0 Compact with a 4" barrel. The 3.6" model does not have enough available picatinny to fit the light.
The Streamlight Rail-Mounted Weapon Tactical Flashlights should work fine with the Glock 19 Gen 4.
The Streamlight Rail-Mounted Weapon Tactical Flashlight will fit the Glock 19, but is not compatible with the Glock 26.