Scorch says:
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If I were to look at bargain barrels, Green Mountain would be my first stop. Better than Brownells barrels.
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Note the fact that Ruger used Green Mountain barrels in those 20 or so Palma rifles they made for the 1992 US Palma Team to use in the 1992 World Championships at Raton, NM's NRA Whittington Center Range. At a big match there in 1991, those rifles (and therefore, barrels) were tested with the handloaded ammo loaded for the 1992 match that shot about 1/2 MOA at 600 and 3/4 MOA at 1000 yards in members own personal rifles as well as a few dozen other Palma rifles from other countries. The Green Mountain 6-groove barrels shot about 1.5 MOA at 600 and 2.5 MOA at 1000. Those with 4-groove barrels shot about 25% better. The US Team members shot their own rifles. The NRA ended up storing those rifles at the Whittington Center and a year or so later sold them at auction. The were pretty good circus tent stakes.
Note on Green Mountain's web site the state some barrels are "precision air gauged." Which means they measured their groove diameters. No mention whatsoever what the average diameter is nor what the tolerances are. Stay far away from such products so marketed.