Streamlight ProTac Rail Mount 2 tape switch was acting funky during my last carbine class so I swapped it out with an Arisaka tailcap adapter and Surefire tailcap and switch : r/ar15
Streamlight ProTac HL-X 1000-Lumen Rail Mount WeaponLight w/ Remote Switch
Streamlight 69262 TLR-1 HL Gun Light
Streamlight ProTac Rail Mount HL-X: Initial Impressions - Redpass Training