My guess would be a defect in the extrusion process. We have seen extreme heat exposures on piston guns for some time with shrouded rails as well as suppressors. Never proved to be a problem in that area. The only other time I have seen it is when the rails partially obstructs the blast area of a comp/brake. We always make every effort to take care of people period. There is no return policy here. It goes like this, you have a problem we fix it, the end. We even replace rails for people who admit they installed their thermal bushings on upside down and cracked the clamp ears.
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