A 5.56 FAL is certainly not junk...one made by Bobcat? well, thats a different story entirely...The Brazilians had great luck with thier MD2, so much so that Imbel continues to produce it, though it has since be relegated to second line duty...It is encountered in other SA countries.The biggest problem with a 5.56 FAL is the weight. You get all the heft of a FAL without the added benefit of 7.62 NATO power.There was a time when I would have given a kidney for a Springfield SA48 5.56 FAL until I shot one. It was sufficiently accurate/reliable and a great gun, but it was obese.Still, one with a DSA style scope rail and para folding stock would be extremely cool. Im not sure about 5.56/7.62 parts interchange, but MD2 literature states "maximum commonality".... whatever the hell that means in Brazil.
A 5.56 FAL is most certainly not a FNC, or even a CAL. The FNC is simply an AK made by FN. Strip an FNC and a SLR106F side by side and you will quickly see what I mean.
The Sig 55x is obviously inspired by the AK, but some changes were made. FN basically made a lighter/improved Galil. A 5.56 FAL/MD2 retains the original FAL operating system, including adjustible gas regulator.
The cool factor is there, but practicality/price? Forget it...Love it or hate it, the AR/M16 is among the best fighting rifles ever concieved. With the market the way it is now, its so hard to justify buying anyhting but an AR, no matter how cool other weapons are.
While the DI system lacks some of the full auto abuse potential of piston weapons, especially in a carbine system, its none the less extremely reliable. Eugene Stoner knew a thing or two about piston guns but ultimately settled on the DI system. Its ultra accurate and has a minimal amount of parts. Carry a spare complete bolt carrier and you can fix any serious malfunction/breakage as fast as you can change a magazine.
Chuck an extractor in another system and you are doomed without armoroer support.
Given the fact you can have one of the best assault rifles in the world for around 1k, these other manufactures price themselves right out of the game. Why spend 1500 for an inferior weapon? Id love to buy a 5.56 FAL for a curiousity, just like I'd love to have a V93 or Robinson M96 but the price/performance ratio is way off. None of those guns can hold a candle to a 700.00 DPMS/Bushmaster/RRA AR.
The 5.56 FAL came out of a need for a low cost/convient 5.56 rifle for those using/mfg FAL's. If you aren't saddled with a million FAL's and production facilities, a 5.56 FAL offers no real advantage, other than being cool. Time will tell if Bobcat got it right...Im not going to give them 1k+ to do thier r&d work though.