https://i.redd.it/ko62v5gi80151.jpg

I'm probably going to run the above Olight. It fits the M18 perfectly. If I had an M17 I'd probably run the FDE Streamlight FDE TLR-1.

OLIGHT PL-Mini 2 Valkyrie 600 Lumens Magnetic USB Rechargeable Compact Weaponlight with Adjustable Rail, High Performance CW LED Tactical Flashlight with Built-in Battery https://www.amazon.com/dp/B07MJ61CQ9/ref=cm_sw_r_awdo_VNJ0743CQF25117NKAFN

STREAMLIGHT 69266 TLR-1-HL High Lumen Rail-Mounted Tactical Light, Flat Dark Earth - 800 Lumens https://www.amazon.com/dp/B01BVSI3QM/ref=cm_sw_r_awdo_FBKTF7N9A7EJ19X5AJBB