Below are the specifications of the Weaver K4 as listed in the 1960 Weaver Catalog and other source materials from the time.

Magnification: 4X

Field of View: 31ft

Tube Diameter: 1 inch

Eyepiece Diameter: 1.445 inches

Objective Diameter: 1.550 inches

Eye Relief: 3 - 5.5 inches

Length: 11.25 inches

Weight: 9.5 ounces

Adjustments: External 1/4 MOA click

Crosshair Options: Crosshair, Post and Crosshair, Range-Finder, Dot (Range-Finder and Dot crosshairs available at an extra cost)

Original MSRP: $45.00 (1961)

Inflation-Adjusted MSRP (2026 dollars): $500.00

Additional Features: Constant centered reticle, nitrogen processed