Colt Diamondback .22 LR 4 in Blued DA/SA Revolver (1978) — Vent Rib, Adjustable Sights
This 1978 Colt Diamondback in .22 LR pairs Colt's high-polish blued finish with a 4 in vent-ribbed, full-underlug barrel and fully adjustable sights. Built on the Colt D-frame with V-spring (leaf-spring) lockwork, it features checkered walnut grips with gold Colt medallions and the prancing Colt logo. Marked with the Hartford, Connecticut address and part of the R-prefix D-frame serial block, this U.S.-made revolver reflects hallmark 1970s Colt production.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: Inspection aligns with the ratings above for both the firearm overall and the bore.
What's Included
- Colt Diamondback .22 LR revolver (4 in barrel)
The Diamondback is Colt's D-frame double-action/single-action revolver, and this example is chambered in .22 LR with a 6-round cylinder. It retains the classic V-spring lockwork, a serrated (grooved) trigger, and an exposed hammer with a wide serrated spur for confident manual cocking.
The carbon steel barrel is configured with a vent rib, full underlug, and a shrouded ejector rod. A knurled ejector rod tip provides positive purchase during ejection, aligning with the model's refined small-frame design.
Sighting equipment includes a ramped, serrated front sight and a fully adjustable square-notch rear sight for precise point-of-impact control. The 4 in barrel length offers a well-balanced profile in this caliber.
Finish and markings are consistent with late-1970s production: a high-polish blued steel frame and receiver, the prancing Colt logo on the frame, and the Hartford, Connecticut address rollmark. Production in 1978 places it in the R-prefix D-frame serial block, a detail of interest to Colt double-action collectors.