Colt Offensive Individual Combat Weapon System LMG Prototype

Published on December 13, 2025
Duration: 24:27

This guide details the disassembly and maintenance overview of the Colt OICW Mark II LMG Prototype, focusing on its unique external piston system and quick-change barrel. It highlights key components like the pyramid-tipped gas piston and the modified bolt carrier group with 'skis' to prevent carrier tilt. The information is presented with the authority of a former Colt employee and firearms historian.

Quick Summary

The Colt OICW Mark II LMG Prototype featured an advanced external piston system with a pyramid-tipped gas piston and a quick-change barrel. Its bolt carrier group included 'skis' to prevent carrier tilt and a reinforced carrier key for enhanced durability, reflecting significant engineering development from former Colt experts.

Chapters

  1. 00:00Introduction to OICW Program
  2. 02:24OICW Mark II Family of Weapons
  3. 03:17Colt LE1020 and Piston System Evolution
  4. 06:08Colt OICW Mark II LMG Prototype Details
  5. 08:46LMG Quick-Change Barrel and Gas System
  6. 11:48Bolt Carrier and Internal Enhancements
  7. 14:41Colt's Marketing Strategy and Program Legacy

Frequently Asked Questions

What was the purpose of the Colt OICW Mark II program?

The OICW Mark II program aimed to develop a family of weapons, including a Light Machine Gun (LMG), based on Colt's LE1020 external piston system, intended to replace various small arms in the military inventory.

What are the key features of the Colt OICW Mark II LMG prototype's gas system?

The LMG prototype utilized an external piston system with a pyramid-tipped gas piston for even gas distribution. It lacked gas rings to reduce wear during high-volume fire and featured a quick-change barrel assembly.

How did Colt address potential carrier tilt in the OICW Mark II LMG prototype?

The bolt carrier group was specifically modified with 'skis' on the rear to mitigate carrier tilt. Additionally, the carrier key was redesigned to transfer impact force directly to the carrier, enhancing durability.

Why was the Colt OICW Mark II LMG prototype not widely marketed?

Colt was reportedly hesitant to aggressively market their external piston system, fearing it would imply their standard internal piston M4 was inferior. This cautious approach allowed competitors to gain market share.

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