I googled, went to LWs website, read at least 3 reviews, etc. If it's published at an easy to find place, it's recent. It matters to me because I'm not a huge fan of the 1/10 (S3F) or slow 1/20 (KKM)--though I've used both.
It was not very easy to find, I just had the time to fool with it. I should have linked the location, but I didn't and I don't want to repeat the search. I note that Apex is having Plastic M&P barrels made up by Barsto with 10 twist. They say that the torque reaction of the fast twist firms up the lockup and improves accuracy. I finally found out what the difference is between a Sig P210 standard barrel and their "lead bullet barrel." The standard has a 10 twist, the lead bullet special 20.
