Zeonic Front: I'd fudged the Armored GM listing by simply putting "machine gun," since it uses the 90mm version in the game but carries the 100mm version in the model sheet art. I've added "machine gun" and "assault rifle" to the Mudrock's list; are we sure that the Armored GM can carry both the beam gun and the beam
spray gun?
RX-78-7 Gundam: The problem is that every source that lists its armament, even the HG-UC kit, is simply copy-and-pasting from the old M-MSV specs. One of the giveaways is that, when they're listing specs for the Heavy Full Armor form, they never ever mention the 8-missile pods on the back of the booster - even though these are explicitly called out in Katoki's line art, used in the manga version, and apparently added to the design at the specific request of the game designers, who wanted the missiles to launch from a location that would be visible in the game's rear view. So I still don't believe the M-MSV specs are relevant to the game version, and sources that simply copy-and-paste them in - like the Game's MSV column and the HG-UC manual - give me the impression that the writer hasn't even
looked at the game design.
Gundam GP02A MLRS: Those armament variations sound a bit obscure to me. Perhaps they were depicted in Gundam Ace at some point?
MP Big Zam: Actually "anti-air missile x 6". These are probably the small openings next to the cannon, yes - I've added them as "unconfirmed".
Gyan Custom: I think the "beam lancer" thing was purely a mistake on the part of Data Collection 13, which mislabeled the Gyan Kai's weapon (and misidentified the Neue Ziel II's funnels as "missiles"). It's never had this in any of the games, and I don't think it really exists.
Titania: Yep, the beam swords are in the forearms. It shows this in DC 13 and in the game animation. In GGF, the "dual beam gun" animation shows it firing the rifle, so this is purely a disagreement about what the rile should be called. According to my GGF game guides, it doesn't have an I-field, and according to the G Generation World wiki I checked it doesn't have one in that game either.
Gigantic and MP Hamma Hamma: Sorry, no idea where the sabers are hidden.
Phoenix Gundam: I think the MA form vulcan gun(s) have only ever been mentioned in the "G Generation Real" feature in Dengeki Hobby. I've added them as "unconfirmed" also.
Ez8 Heavy Armed Custom: Likewise, the beam sabers were mentioned in the G Generation Real feature, and discussed in the photo coverage of the accompanying model. I'd say that's enough to qualify them as "unconfirmed."
Dom Gross Beil: The Dom Tropen's "beam point" has actually never appeared on any published armaments list either. I'll put this down as "unconfirmed," and I'll do the same for the regular Tropen when I get to it.
Dezpada: The shield items are definitely beam cannons - these were usable weapons in the original game. The shields may just be part of the binder, which is mainly made up of recycled GM III armament. As for the beam saber, it's not a usable weapon in the game and it's not shown in the model sheets, but if it's shown in the attack animations then I'll bump it up out of the "unconfirmed" ghetto.
Extreme Gundam type-Leos: I think the beam daggers are indeed separate. They're a different shape from the sabers, and they're apparently stored in the waist. (As per
this Gundam.info feature.)
-- Mark
(That info is easily gathered from the HG booklets.) 
The anime f/x suggest machine guns rather than beam weapons too. 
