I think Darkhold here has the SA58 and cipherblue on TAC has an KA FAL.
You are probably thinking of mine. I ran with it at SASCO last weekend. I rode with Darkhold to the last game, but I was using my own gear.
That was the first skirmish I had done with it but I was happy with the performance. I would say it's pretty standard stock CA performance. I haven't used it enough to make a long term report, but so far it is great. My only complaints about the gun right now are no standard/mid mags and it's stupidly hard to find the RIS kit for it. Last I looked, only two retailers (both HK) carried it.
Mags are NOT compatible between the CA and KA guns. Nor could they be modified to work (at least within reason).
Oh, one other note that might be an issue for some....
The standard iron sights have too low of a profile to use wearing goggles effectively. I was using an Aimpoint and a flip up rear sight. They co-witnessed perfectly and I was very pleased with the performance.
Ice, if you just want to get an general overview of the gun, I did write a short review on it in the reviews section.
One thing to keep in mind is that the Classic Army version is the SA-58 Tactical Carbine version (in other words, 13" barrel). I believe both King Arms FAL's are considerably longer than that. That may be good or bad depending on your planned usage. I had a 250mm "barrel extension" on mine at the game and that was plenty long for me.