Colt Government Model MK IV/Series '70 .45 ACP 1911, Two‑Tone (Polished Blued Slide / Matte Gray Refinished Frame), 5-inch, Bo-Mar Adjustable Rear Sight, Hogue Wraparound Grips (1982–1983)
This Colt Government Model MK IV/Series '70 is a U.S.-made, pre-Series 80 .45 ACP 1911 from circa 1982–1983, notable for its polished blued slide, matte gray refinished frame (non-factory), and period-correct rollmarks. It is outfitted with a genuine Bo-Mar fully adjustable rear sight, a high-profile red-insert front blade, Hogue wraparound rubber grips with finger grooves, and ambidextrous manual thumb safeties. The result is a clean, purpose-built Government Model with desirable target sights and a traditional five-inch configuration.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minor superficial scratches and blemishes present. The takedown screw extends slightly from the right side of the frame.
What's Included
- Colt Government Model MK IV/Series '70 .45 ACP pistol
- 1 unmarked steel single-stack 7-round 1911 magazine
- Bo-Mar fully adjustable target rear sight (installed)
- High-profile blade front sight with red insert (installed)
- Hogue wraparound rubber grips with finger grooves (installed)
- Ambidextrous manual thumb safety levers (installed)
Built on Colt's full-size 1911 platform, this Government Model features a five-inch barrel, single-stack 7-round capacity, and single-action operation. It is the pre-Series 80 configuration without a firing-pin safety, a detail many Colt enthusiasts look for in this era.
The sighting setup is anchored by an original Bo-Mar brand fully adjustable rear sight paired with a high-profile front blade carrying a red insert. Bo-Mar components are now discontinued, making genuine examples a notable upgrade on a period Colt.
The pistol presents a two-tone finish: a polished blued carbon steel slide over a matte gray frame with a bead-blast/parkerized appearance (non-factory refinish), with rear cocking serrations, no front serrations, and a lowered, slightly flared ejection port with relief at the lower rear (non-factory modification).
Observed markings include: left slide "COLT'S MK IV/SERIES '70 GOVERNMENT MODEL .45 AUTOMATIC CALIBER" with the Rampant Colt, right slide "COLT'S GOVERNMENT MODEL," barrel hood "COLT .45 AUTO MK. IV/SERIES '70," and right frame address "COLT'S PT. F.A. MFG. CO.
HARTFORD, CONN. U.S.A." The serial suffix "B70" is consistent with Series '70 numbering.