From what I've read, both in TPS and by Forum posters, the larger frame (bigger bore) guns were less apt to be affected by the interference of the straight lever and the right hammer.
I have three sixteen-gauge, 0-frame TA hammerguns with the fishtail top lever and all three open easily with the right hammer cocked and on these three guns it would not be possible to do so if they were equipped with the straight lever.
Every serious Parker shooter/collector/afficionado should have both volumes of The Parker Story.
A good amount of new information has come to light since publication but TPS truly is the very best source of compiled Parker information for the Parkerphile.
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