The Streamlight ProTac Rail Mount HL‑X is a rugged long‑gun-mounted light designed for tactical, duty, & home-defense use. It delivers a powerful 1,000‑lumen white beam with selectable high, low, & strobe settings via the TEN‑TAP programmable interface. Featuring dual-fuel capability, it runs on either two CR123A lithium batteries or a rechargeable SL‑B26 USB-C Li-Ion pack. Its tool-free rail clamp ensures secure, fast attachment to Picatinny or M-LOK rails, keeping hands away from the muzzle during installation. Made from machined 6000-series aluminum with a tempered glass lens, the unit is built to withstand recoil, weather, & impact, earning IPX7 waterproof rating (with tail switch) & IPX4 (with remote switch). It operates reliably across -40°F to +120°F environments. Compact and efficient, the ProTac Rail Mount HL‑X measures 5.43" long, 1.45" wide, & 1.72" high. With CR123A batteries installed, it weighs 6.4 oz, with the SL‑B26 rechargeable pack, it weighs 6.9 oz. In high mode it offers up to a 332 m beam distance (up to 447 m with SL‑B26), while low mode extends runtime dramatically. Multiple activation options tail-cap, remote pressure switch, or strobe provide tactical flexibility & the anti-roll head ensures stable placement when off weapon. It’s built for mission-critical reliability & versatility.