Colt Monolithic Polymer Lower from the Vietnam Era

During the Vietnam Era Colt made prototype monolithic polymer receiver M16s.  These photos are from an online auction where one came up for sale. Plastics and materials technology just wasn’t advanced enough back then for Colt to make this work.

Fortunately plastics technology advanced and the monolithic polymer receiver concept advanced with the CAV-15 In 2000 and then the CAV-15 MKII In 2003. The design team at Cav Arms in 2002-2003 never saw one of these Colt units until after the CAV-15 MKII was in production. So many of the general design concepts and reinforcements are similar. Separated by decades; people that knew the strengths of plastic reached similar design conclusions.

In 2020 the monolithic polymer receiver concept takes another step forward with the KE Arms produced MK3 receiver.

About SinistralRifleman

I've been competing in the action shooting sports since 2002. I believe competition shooting to be an excellent way to build gun handling and marksmanship skills and encourage all gun owners to seek out some form of competition shooting. Anyone can become reasonably good at it if they devote the time and resources to do so. Winning, while nice, need not be your goal; bettering yourself through the pursuit of excellence is something we all can achieve.
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