No doubt. I've always been a fan, but haven't ever had to use their CS. I can't say that I'm surprised that they took care of it, even if they didn't have to. BCM & Paul are absolutely the best in the business!
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Getting an overtorqued or othwrwise seizes barrel nut is one of the main reasons I started using handguard that attach via a standard USGI barrel nut. You can avoid the problem altogether if you simply don't have to remove the barrel to install the handguard. I usually run Troy Alphas but there are plenty of others out there such as Centurion and Apex.