Caveman's Spark 5/8" Thermal Crush Washer - Choose Color

What does it do?

• Black to Bright at 131F (55c)
• Know when your barrel is too hot to safely handle or store.
• Color activates at common bullet drift temperatures.
• No more guess work.
• Insanely bright & awesome colors.
• Makes crush washers cool (at least…as cool as possible).

No more stupid:

• Hand hovering
• Barrel tapping
• Spitting (people really do this…stop it)

Note: extended operation over 450ºf can result in breakdown of thermochromic properties.



***Note about Installation***

If more than 180 degrees of tightening is required for timing, please use shim. Over tightening can cause damage to the Spark™ and it’s coating.