The Thorntail X 1913 Offset Light Mount provides optimal weapon light positioning in a minimalist footprint. The low profile design replaces the stock Picatinny (1913) rail adapter positioning the light closer to the rail while maintaining clearance for thumb-over-bore light activation. The 1913 Offset Light Mount enables light placement in four positions around the rail (1:30, 4:30, 7:30, or 10:30 clock positions).


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Built for strength, Thorntail X mounts are machined from 7075-T6 Aluminum and MIL-A-8625 Type III hard coat anodized resulting in a mount that exhibits nearly twice the tensile strength of competing light mounts using industry standard 6061-T6 Aluminum.

Thorntail X mounts are compatible with Surefire: M600 (B/C/P/U/DF/V), M603V, M612 (V), M622 (V), M300 (A/B/C/V), M312 (V), M313 (V), M322 (V); Streamlight: ProTac HL-X (88066/88071); Cloud Defensive: REIN (1.0/2.0), REIN Micro (1.0/2.0); Modlite: OKW, PLH (v2); Arisaka: 300 Series, 600 Series, 18650 Series; Olight: Odin

Product Specifications

  • 1.3” (L) x 1.25” (W) x 0.54” (H)
  • 0.86 oz
  • Machined from 7075-T6 Aluminum and MIL-SPEC hard coat anodized (MIL-A-8625 Type III)

Item Comes With

  • (1) Thorntail X 1913 Offset Light Mount
  • (1) Thorntail X 1913 Clamp
  • (2) Light Body Screws (8-32 x 1/4”)
  • (2) Clamp Screws (8-32 x 1 1/8“)

Note:This product is designed for use on MIL-STD-1913/STANAG 4694/Picatinny handguards and rails.

Additional information

Weight .2 lbs
Dimensions 8 × 4 in


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