The Movie 2009 Landmine mold, and its repaints Armorhide and Commetor all have two ways to use their weapons.
They can hold it in hand.
Or, if you pop the gun off its lever and flip it, you can put it on his back, and swing it forward, making a shoulder cannon.
I dont know HOW the gun is supposed to be snapped onto that lever, but I have to pop it off and flip it to make it work.
Also, TF Prime RiD Arcee's back kibble is WAY more managable if you pop the front wheel off. You can then peg it onto her BFG to make an ammo clip. Put the blade of to make a Bayonet, and you've got:
1 Wheel storage.
2 A BFG that makes sense as a BFG.
3 WAY less kibble.
Just take the wheel connector, fold it behind her head, and your gold.
If you take Nightstick, Transform him about 3 quarters through, then pop him on the bottom of Skyhammer in Helicopter mode, feet faceing outward, it looks AMAZING as a chopper gun, not to mention that it fits like a glove, but ONLY if it's transformed that exact way.
You can give HFTD Lockdown a targeting system by taking the roof and flipping it over his head in robot mode, also kinda works to deflect incoming fire like a movable shield when in a pinch.
Iv'e been messing with my figures alot today.