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Arisaka Defense Tailcap Adapter
California Proposition 65 Warning

This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.

Arisaka Defense

Tailcap Adapter

$35.00
Available California compliant

Arisaka Defense Tailcap Adapter, Fits Rail Mounted Streamlight ProTac HL-X, Anodized Finish, Black, Allows Use of SureFire Tailcaps on Rail Mounted Streamlight ProTac HL-X TA-RMHLX

Key Details
Brand Arisaka Defense
Manufacturer Part Number TA-RMHLX
UPC 601557939517
SKU ARSTA-RMHLX
Current Stock 53 available
Quantity Updated Apr 23, 2026 2:40 PM
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Purchase Requirements
  • Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description

This product is not compatible with the Protac 2.0 Rail Mount Lights. This adapter requires the use of a Surefire UE or DS tailcap to function, which is not included. The Arisaka Tailcap Adapter allows Streamlight Protac Rail Mount HL-X lights to use Surefire Scout tailcaps and remote switches. In particular, the Protac Rail Mount lights can now be used with the Surefire SR-D-IT and TNVC/Unity TAPS dual switches, which are commonly paired with laser/illuminators like the ATPIAL and DBAL series. One of the main flaws of the Protac Rail Mount lights is also addressed: Streamlight did not design a front battery spring into the light, so under recoil the battery can come off the front contact and cause the light to flicker or blink. To help prevent this behavior the adapter includes two different o-rings (one for CR123 cells, one for 18650 cells) which can be placed on the back end of the battery before screwing on the adapter. The o-ring ensures the battery cannot move rearward while firing. This adapter requires the use of a Surefire UE or DS tailcap to function. It also does NOT work with the Rail Mount HL-X Laser model.

Features
  • Diameter: 1.04";Length: 0.49" additional length to light (plus tailcap)"
  • Weight: 0.6 oz
  • The Arisaka Tailcap Adapter is CNC machined from 6061-T651 aluminum and MIL-A-8625 Type III hard coat anodized
  • Made in the USA
Specifications
UPC: 601557939517
Manufacturer: Arisaka Defense
Manufacturer Part #: TA-RMHLX
Model: Tailcap Adapter
Finish: Anodized
Type: Part