Watch the difference in behavior between a Carbon barrel and an Aluminium one. Both set up as Tuna guns, with twin 16mm bands and a 7,5mm spear. The carbon tube is much lighter than the aluminium, about 1/3rd. This means that the gun will be too light. Because of this we we add a lead slug inside the muzzle to help with the mass. The fact this extra mass is all up at the front end of the gun, basically in the muzzle, it helps prevent the muzzle from lifting when shot. All the recoil is now directed straight back. This prevents the muzzle from hitting the spear as it leaves. If the spear is nudged a little, as with the aluminium barrel, it will make the spear wobble and slow down quicker.

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