There was a poster here years ago who served in Sinai Desert with 101st. ABN DIV. Peacekeeping force. He worked with the regular Egyptian Army. He said their weapons maintenance was non-existent. I suspect their training as well was poor.
There are better weapons, there are worse weapons. If not maintained properly, no weapon is good. They all require it. Wish they didn't. Spent many, many hours cleaning weapons after hunting, shooting, and work.
The m4 is basically a 400m carbine. The DoD wants the new rifle to be 600meter capable apparently. That definitly rules out the much vaunted super rifle known as the AK. It also rules out any piston shooting a .223/5.56 and some pistons rifles altogher.