7.5" Two serial # prefix .45 NM Blackhawk
OAL 1.976"
Cylinder 1.702"
Diameter 1.730"
5.5" Two-serial # prefix SS .45 NM Blackhawk
OAL 1.977"
Cylinder 1.702"
Diameter 1.730"
4-5/8" Two-serial # prefix .45 OM Vaquero
OAL 1.979"
Cylinder 1.701"
Diameter 1.730"
Where OAL = total length from tip to tip. (front of gas seal to rear face of ratchet)
Cylinder = just front face of cylinder to rear face of cylinder, ignoring gas seal and ratchet.