Arisaka Defense Momentary Tailcap Black TC-2 for Scout Lights

Description

The Arisaka Defense Momentary Tailcap is a clean, purpose-built replacement switch that strips your weapon light down to the way a lot of instructors want it to run: press and it's on, release and it's off. There's no click detent to fumble past under stress, which is where a lot of the accidental activations happen with clicky-style caps. Twist the cap all the way in and you get constant-on when you need to leave the light running.

Setup is refreshingly simple. You thread the cap onto the light body until the light comes on, then back it off roughly half a turn to a turn and a half until the button travel and feel match what you like. For storage or transport, backing the cap out about two turns takes tension off the switch so you're not draining a battery or lighting up your bag when you don't mean to.

What the Arisaka TC-2 Bolts Onto

This tailcap is built to fit the Arisaka 300, 600, 18350, and 18650 Series light bodies, and it also threads onto SureFire Scout lights. That crossover compatibility is a big part of the appeal, since it lets you standardize the same switch feel across different lights in your kit. It's a switch only, so you're keeping your existing head and body and just swapping the rear.

Build Quality on the Momentary Tailcap

Arisaka machines this cap from 6061 aluminum and finishes it with a MIL-A-8625 Type III hard coat anodize, the same kind of finish you'd expect on hard-use rifle parts. It's made in the USA and comes in at just about an inch long and less than half an ounce, so it isn't adding any real bulk or weight to the back of your light. Folks who run these tend to point to how durable and compact they are, and the low-profile black finish keeps it quiet and glare-free on the gun.

If you've been living with a clicky cap and want cleaner, more predictable light control, this is a straightforward upgrade that gets out of your way.