As a Colt Armorer, I have never heard of a Factory Colt HBAR shipped with a .223 commercial chamber. If Colt ever did use a commercial .223 chamber, it would have been long ago, in the very beginning - although I do not believe they did. The reciever marking may have been an attempt to "Commercialize" a controversial "Assault Weapon" and make it seem "less military". On the top of the barrel in front of the front sight should be a stamping with the military designation - 5.56, C (chrome) and MP (proofed and Magnetic Particle inspected) and 1/7 (twist) - in which case it is totally safe to shoot with any NATO spec 5.56 Military round. I would assume that the Israelis would adhere to that spec, and what the commentator saw was a bright muzzle flash and sharp report from a real, full power 5.56 NATO load. Most US commercial is a little light.
Colt's chambers have long been MilSpec, and they did not offer a "Commercial chamber" as did some of the clones. You could ask over on AR-15.com if anyone there knows of an exception. How is your barrel marked?
And the only way I know to "explode" a Colt AR is to leave out the bolt cam pin on assembly (DON'T!!!!!) or plug the bore.Information
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