Colt MK IV Series ’70 Government Model .45 ACP – Custom Upgrades –
This is a recently acquired, customized Colt Government Model .45 ACP, part of the MK IV Series ’70 line produced from 1970–1983. Serial 70G74256, places it in the 1974-1975 production run. It has markings indicative of being an Armand Swenson build.
The Late Armand Swenson (1916-1996) was a visionary SoCal gunsmith best known for revolutionizing the Government model 1911 into a reliable, combat-ready sidearm. His patented ambidextrous safety, stippling, custom trigger guards, and bo-mar sight installations set the template for modern 1911 customization—a legacy that endures in virtually every high-end custom build today.
This gun displays several of his style features.
Premium upgrades:
Slide with no side markings and an added compensator.
Frame marked by "Smith's Gunsmithing San Bruno Cal" -
Stamping is an indication of work performed, such as timing adjustments, fitting, or safety installations by a licensed gunsmith.
Serrated Top Strap
Bo-Mar adjustable rear sight
– highly respected for precision shooting
Patridge-style front sight
– improves precise sight picture
Square, checkered trigger guard
Custom Magazine Release
Custom Checkered front and rear strap
– adds secure grip and control
Rosewood Checkered grips
Mechanically fine-tuned and still shooter-ready, with a bright, clean barrel, and a light crisp trigger pull
Specifications
Manufacturer:
Colt
Model:
MK IV Series ’70 Government Model Per Colt Serial Number Lookup - Unmarked Slide
Caliber:.45 ACP
Capacity:
7+1
Barrel Length:
5-1/4″
Slide Length:
8-1/8"
Finish:
Blued/Matte Stainless
Sights:
Bo-Mar adjustable rear + Serrated Front
Trigger:
Adjustable Serrated
Hammer:
Skeletonized
Serial Number:
70G74256 (1974)
Condition:
Good/shooter-ready – bright bore, heavy-duty frame, ready to perform
Historical Background & Significance
Series ’70 Colts
introduced the split collet barrel bushing for better lockup and accuracy—a defining feature of this series.
Production ran from 1970 to 1983, with this serial prefix 70G
confirming 1974 manufacturing
The Bo‑Mar adjustable sight is a hallmark of target-grade or custom 1911s and retains market desirability
Unfortunately, we don't have many details for provenance on this pistol, but it is sure to be a shooter with clear Armond Swenson style.
Condition Summary
This pistol is in good condition
with typical wear from use and handling. The barrel remains bright and clean. The frame is a stainless matte, and the slide is a worn blue. Custom checkering to the front strap ensures a strong but comfortable grip.
FFL Required
An FFL is required for shipment. Please email a copy of your FFL with the product name in the subject line to: info@tylergunworks.com
