Caveman Spark AR-15 Crush Washers That Change Color When Hot

By Doug E

Earlier this year, Caveman LLC introduced a series of crush washers for AR-15s that change to bright colors when the barrel starts to heat up past 131 degrees F (55 degrees C). Caveman states that the intended idea behind their Spark AR-15 Crush Washers is to warn shooters when the barrel is too hot to […]
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Source: The Firearm Blog