Colt Government Model Mk IV/Series 70 .45 ACP, 5-Inch, Blued (MFG. 1978) — Original Series 70 with Accurizor Collet Bushing
Manufactured in 1978, this Colt Government Model Mk IV/Series 70 is a full-size .45 ACP 1911 in original Series 70 configuration. It features Colt's Accurizor collet bushing with a matched barrel, a classic blued finish with polished flats and matte rounds, and large 1970s-era slide rollmarks. The G70-suffix serial series indicates late-1970s commercial production.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm is in solid shape. There are some scratches and blemishes present. The bore is clean and shiny.
What’s Included
- 1x 7-round single-stack steel magazine
This Mk IV/Series 70 retains the original Series 70 design without a firing pin block, favored for its classic internals and clean trigger characteristics. The pistol is built on the full-size 1911 platform with a 5-inch barrel and a 7+1 capacity, chambered in .45 ACP.
Colt equipped this model with the Accurizor collet bushing and a matched barrel, a hallmark feature of the era intended to enhance barrel-to-bushing fit. The slide shows rear vertical serrations and a standard ejection port, paired with fixed sights that include a small blade front and a square-notch rear.
The finish is blued with polished flats and matte rounds over a carbon steel frame, presenting the classic commercial Colt appearance of the 1970s. Controls and setup include a wide spur hammer, a serrated trigger face, an arched and vertically serrated mainspring housing, and a GI-style grip safety tang.
Checkered wood grips with Colt gold medallions complete the period-correct look. Additional markings include an "F" inspector mark on the right front trigger guard. The G70-suffix serial series and large slide rollmarks align with late-1970s commercial production, and this example is marked as MFG. 1978 in the records.