John ,I have a PH 20 Ga. for sale on our site now and also on GB ,that has basically the same scenario as you are mentioning ,but the thin wall is only about 4 " in length as Mike says directly behind the Choke 19 Thou.. I have carried the gun for years ,and have had no problems ,I shoot RST low pressure through it ? My bores do not appear to be honed or polished ,but as far as selling this gun I have had little interest in the gun and I imagine this is the concern ,mine is in the Left barrel ! Russ
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