I put this together after a recent trip to Israel. Saw a bunch like this. Carbines made from old M16a1 receivers but with M4 barrels.
Updated specs: This one has 1970s M16a1 Colt CH upper, old m16 Colt bcg, Bushmaster 1/7 chrome lined m4 barrel, w FSB. BCM Lower with Brownells CAR-15 type stock and vintage Colt grip. Old gooseneck mount. Holosun dot. Never saw any Holosuns in Israel, but I can't find the right Meprolight.
Attachment 62137