You can physically change your body into any form of weapon, other than Tinkertech. The only limitation is you cannot exceed twice the total volume of your body with the amount created. You could change your arm into an artillery piece, or you could make it into 50 smaller gun barrels, but you cannot go over twice the total volume of your arm. You can control every weapon created on your body as long as they are attached, so the 50 barrels could all point in 50 different directions and could move around as you desired. Any ammunition fired is created by the power and uses no body mass.