Milkshape 3D is personally my favorite and many other people's favorites.
Of course, you have to pay for it, so I'm not sure if you want it.
It's literally built for Blockland, super easy to use, has all you need, and you can whip stuff up fast. I remember trying it, and I literally learned completely from scratch. I didn't use any tutorials as I I think it's better to self learn than be taught; like scripting.
So if you're aiming for some nice Blockland stylish guns, use Milkshape. If you have any questions, go on, ask me or message me.