There is no standard for what wall thickness "should" be. Thickness varies with every gun. Based on the amount of metal was removed in factory striking, and also if they have been refinished or not. The critical spot it around the tip of the forend, this is where pressures are greatest. Check out the couple threads that have been linked in above for more info. Wall thickness must be measured with special tools. Simply checking the muzzle end will not do it.
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B. Dudley
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