Hey wait! You left out the Israeli Negev, the Spanish Ameli, and that cute little lead-spreader from Singapore, as well as the old Stoner 63/Mk23.... 
Maybe they could replace the SAW qith a reliable, proven system, say
RPK (or RPKM) - oh, wait, it has only a 40 rd magazine
OK - how about a RPK-74
Oh, wait, it’s magazine fed as well./
Ok, how about a PK
250 rd belt, oh, wait, too much like an M-60 - called the Hog for a reason.
The Brits L86A1? - 5.56 and - yup - magazine fed.
Well, Oz troopies use the Lithgow F89, Standard Light Pattern. Nope, just the SAW with a different name.
JSDF use the SAW, so no help from them.
The Singaporean army adopted the new squad automatic weapon, known as Ultimax 100, in 1982. Uses a 100 rd drum magazine. Uses 5.56 NATO. So, maybe this one - eh?
New Zealand - nope, they use the SAW
How about the Swiss SIG MG 51? An updated MG-42 the grunt in your squad better be prepared to hump some ammo, they bad boy can shew it up.
Norwegian Army? NOpe, the SAW again.
The Germans will use the H&K MG4 - belt fed 5.56 NATO.
France? NOpe, the SAW once more.
My point? Not a whole lot of choice out there. THe few that are different are , by and large, magazine fed. Maybe we can score some of those Unimat 100 rd magazines....
Hey wait! You left out the Israeli Negev, the Spanish Ameli, and that cute little lead-spreader from Singapore, as well as the old Stoner 63/Mk23....