3-way Bandai's Gatling gun comparison
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Observations : All have similar distance between primary trigger grip and the secondary grip on top. So if your kit can hold one comfortably, others will probably fit fine.
30MM and AMAIM have primary grip on the bottom of the gun, while GG (HGBC Giant Gatling) has grip on top by default but you can move it to the bottom.
30MM Gatling has a bipod. Or you can remove the middle section containing the bipod to make a somewhat strange short Gatling gun.
GG can be converted into fixed emplacement type. Tripod and other accessories are included.
30MM and AMAIM ones have 4 barrels while GG has 6 barrels and thus much more massive.
30MM one comes with optional ammo drum and ammo belt. (Pictured)
GG includes optional grip that fits 1/100 hands. It is quite large so I guess it won't look to small on most MG Gundam kits.
GG is most detailed and sturdy. 30MM ones are more detailed than AMAIM but slightly fiddly due to modular design. AMAIM one is most simple in design but also most compact.
GG and 30MM ones are cheaper. Official prices for GG/30MM are ¥980 and AMAIM WS7 is ¥1650. However considering what you get prices are relatively similar. (See below.)
GG kit only comes with one Gatling gun. 30MM also only comes with only one gun (receiver and trigger unit) but there are optional parts included. So you can change the gun into something else like a beam cannon or others. AMAIM kit is most expensive but comes with multiple weapons. (A rocket launcher, SMG, assault rifle, flame thrower and a sword.) Albeit AMAIM WS7 weapons are most simple in design