Make that: full tapered chokes, not parallel. Open chokes such as IC, and sometimes Mod, can be less than 4" or so (tapered reamer was run in farther).
Except for very late Savage guns, almost all Fox chokes are full tapered from the start of the choke, to the muzzle. One exception is "Fox Cylinder" in some Savage upland guns which has a slight reverse taper at the muzzle.... kind of like an hourglass in profile.
To reiterate Mike's answer...... card lookups for graded guns > s/n ~10,000 only ........ are available to AHFCA members. Membership info is on the Fox Collectors' home page. A card lookup will verify the original barrel length and gun build specs.
Frank
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