OUCH! M4A1 conversion issue...

Yeah, this is not good.

Some more views of service rifle complications:

I was discussing this today, with a friend who is a retired career infantryman, airborne and mechanized, who served as an EM, NCO, and Officer. He’s sharp, and realistic. He said that while special operations troops often get the weapons they want, grunts traditionally fight with what the military gives them.
He had experience with the M16 as a soldier, and later, made sure that his command track had M16s for himself, the driver, and the TC. Each of them carried .45 pistols, but he wanted them to have rifles to defend themselves in some situations.

Obviously, this story will not likely end any time soon.