On a related point, I've wondered why the coilgun isn't considered a heavy weapon, but instead one of the primary ones...
EDIT: One more thing, while we're picking on these little points - It would really make much more sense if the game called the soliders "soldiers" and not "actors" like it does in some places, I'm guessing that "actor" is some type of programming term or lingo - but not everyone who plays the game comes from that type of background.
I wouldn't call what the coilgun uses "bullets," If I remember right I think it's based on a different, future technology and isn't a regular gun-powder-based weapon. (If it was, I have a feeling the recoil from such a monstrosity of a gun would leave a soldier who just fired it thinking "Wow! That's quite a cannon! Now did I remember to bring a parachute with me...?")
I like the coilgun a lot myself, it's a very nice weapon - although from one standpoint if a soldier could carry more ammunition for it it could un-balance the game a bit. The restriction on how much you can carry for it also encourages the use of smaller back-up weapons, which I think is nice, so the smaller weapons don't just take up space and "collect dust," but instead get used a bit.
I believe that in military terms, "Primary Weapons" are more of primary aim / kill weapon issued as standard arms to soldiers.
Weapons falling in this cat are like M16, M203 attached to M16, AK47, (most semi auto rifles, Assault).
They can also include weapons such as section support weapons (like SAW) or the carbine / Sniper rifles (for mostly scouts, snipers or special ops).
For a weapon to be heavy, its meant more for assault for infantries on heavy / soft vehicles (jeeps, APC all the way to Tanks). These hence, includes basic LAW tubes, M84, Armbrust, Platoon suppression weapons (such as GPMG), down to the more potent grenade launchers or AGL (Automatic grenade launchers).
So, back to coilguns, what is it more of? A sniper rifle rite? Hence, its more of a primary weapon, closer to sniper range weapons. (Since it has only 2 rounds, and no auto / semi-auto function).
Does this sound logical?
(Just a 2 cents worth opinion from a trained soldier.....)