I don't know what you are looking for but thats about all the info that Parker put in the books. If it's serial number corresponds to the time table when single triggers were available it might be factory but I doubt it as that would probably have been mentioned as would have the BTF. Look at the recoil lug on the barrels. The BTF have a reinforced lug and a rod that goes through the forarm for recoil. A lot of guns have aftermarket BTF some with the recoil rod some without. The lug will tell the tale.
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