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According to Dixie Gun Works, all CVA rifle and pistol drums have 10 X 1.25 mm thread. While many people say that both the [Spanish made] Traditions and CVA guns are made by Ardesa, I can't say for sure. But since both Traditions and CVA drums have the same nipple and clean out screw thread, their drum stem thread might also be the same.
A call or email to a supplier like Dixie might help to verify the thread size without actually removing the drum and measuring the Trapper's.
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