Arisaka Defense Tailcap Adapter for Streamlight ProTac HL-X

Expand Your Streamlight ProTac HL-X Capabilities

The Arisaka Defense Tailcap Adapter transforms your Streamlight ProTac HL-X rail-mounted light into a platform compatible with SureFire Scout tailcaps and remote switching systems. This opens the door to pairing your light with advanced dual switches like the SureFire SR-D-IT and TNVC/Unity TAPS, commonly used with laser/illuminator systems such as the ATPIAL and DBAL series.

Solves a Real Problem

Streamlight's rail-mounted lights lack a front battery spring, which can cause the battery to lose contact with the front contact during recoil. This results in flickering or intermittent operation—exactly when you need reliable illumination. The Arisaka adapter includes two precision-engineered o-rings (one for CR123 cells, one for 18650 cells) that stabilize the battery and prevent rearward movement under firing.

What You Need to Know

• Requires a SureFire UE or DS tailcap (not included) to function
• Not compatible with ProTac 2.0 Rail Mount lights or the ProTac HL-X Laser model
• Anodized black finish matches your existing gear
• Includes battery o-rings for both CR123 and 18650 battery types

The Bottom Line

If you're running a Streamlight ProTac HL-X and want the flexibility of SureFire's ecosystem or need to eliminate battery rattle, this adapter is a practical solution that extends your light's versatility.