ARISAKA | Tailcap Adapter - Streamlight Protac Railmount HL-X

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
Modlite Modbutton
Modlite Modbutton Lite (Surefire plug)

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.