Springfield Prodigy with a traditional tac rail should be a compatible fit. We define specific model fits at www.nightstick.com/lightfinder. Best to try using our Light Finder app for verification.
Yes, the Nightstick Tactical Weapon-Mounted Light will be compatible with your P226 Legion.
Most holster fits are compatible, but we don't manufacturer holsters so we can't guarantee fit for the holster(s) you may own, so we recommend verifying with the holster manufacturer before purchase.
Here are the models we recommend: https://www.nightstick.com/collections/weapon-lights/springfield-armory-echelon-compact
The TWM 30 Nightstick Tactical Weapon-Mounted Lights do not have a pressure switch. However, the model at the link below has a pressure switch.
https://www.opticsplanet.com/nightstick-tactical-weapon-mounted-lights-w-remote-pressure.html
The Nightstick Tactical Weapon-Mounted Light might be too large for the S&W Equalizer. I recommend using the light at the link below.
https://www.opticsplanet.com/streamlight-tlr-7a-flex-tactical-weapon-light.html
The Nightstick Tactical Weapon-Mounted Light will fit an HK VP9.
Yes, the Nightstick Tactical Weapon-Mounted Light will be compatible with your Glock 19 Gen 5.
Yes, the Nightstick Tactical Weapon-Mounted Light will fit your M&P when using the SHR9 Rail Adapter.
Yes, the Nightstick Tactical Weapon-Mounted Light will fit and function as intended with the P320 M17.