I ran one mag on full-auto, locked the bolt open and took temperature readings. I started with the Ruger on the Colt F/A lower. Both guns were measured at the barrel at an external temp of 73.5 degrees. I started with a Colt M4 (SOCOM fat barrel) and my Ruger SR556C. Temps were taken on the top of the bolt at 12:00. Temps on the bolts were taken with the carriers removed but bolts still in carriers. ![]() Bolt carrier temperatures were taken with the carrier still in the receiver through the ejection port at the scallop that clears the dust cover. Upper temps were taken on the right side of the receiver in front of the ejection port. For the sake of continuity, I tried to get readings off the same spots on the two different guns. ![]() Both guns were measured before and after firing. Temps were taken in the same spots on both guns. Probably accurate enough for its intended use. It might be accurate and shows a reading of somewhere between 94 degrees and 98 degrees on bare skin. Temperature readings were taken with a cheapo laser thermometer I bought at the local auto parts store.
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