I'm a newbie also but I think I can help you on your way! Read this thread for your upper -> http://68forums.com/viewtopic.php?f=1&t=3737. The 1 in 10 twist is the default from the original specification. That specification had a number of faults due to some sloppy work on the part of the originating company. For some real world references to the differences based on changing the twist and chamber take a look at the down load from the first post in this thread -> http://68forums.com/viewtopic.php?f=1&t=3473. Welcome aboard! :mrgreen:



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