Lab Dosing Gun Barrel 304 Grade Stainless SteelLab Dosing Gun Barrel 304 Stainless Steel This barrel is a direct replacement for the BVV lab doing guns with the plastic barrel. This is a barrel upgrade. If you are upgrading your barrel from a plastic one, consider also buying the pinch clamp (Pinch Clamp). Alternately a large worm drive clamp from the hardware store could be used to replace the pinch clamp. The barrels come in two capacities 25ml and 50ml. Note: Stainless Barrel ONLY does NOT