Arisaka Defense Tailcap Adapter for Streamlight ProTac Rail Mount HL-X


In stock

SKU: TA-RMHLX UPC: 601557939517

Product Description

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.

Compatible lights:

  • Streamlight Protac Rail Mount HL-X

Compatible tailcaps:

  • Surefire UE (Newest version with black ring where the remote plugs in. The old gray ring version is not compatible)
  • Surefire DS
  • Surefire Z68

Compatible Remotes (with Surefire UE or DS tailcap):

  • Surefire ST07
  • Surefire SR07
  • Surefire SR-D-IT
  • TNVC/Unity TAPS

Streamlight’s TEN-TAP Programming is still fully functional with the use of Surefire tailcaps and remote switches in combination with the Arisaka Tailcap Adapter. The current setting is not altered unless purposefully changed just like using the stock Streamlight tailcap.

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-T6aluminum and MIL-A-8625 Type III hard coat anodized. Made in the USA.




Technical Information

Color / Pattern

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit

Customer Reviews

Based on 2 reviews
stacy m.
Very nice

Tail cap was hard for me to find but they had it. Fits great.

Joshua S.
Well made

Very simplistic in design less to go wrong. good product works as intended. Tail cap is slimmer than the factory one so it fits with my Dbal well.