I believe most are interchangeable, the difference in the two is that they were modified for venting gases, so the "solid" one is the early style. If you have a shooter, you'll want to use the ventable type.
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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