You can cut it with a Dremel cut off wheel, but be careful. The thin cutoff wheels snap easily, they make ones that are fiber reinforced. I use those all the time.
Cut it to the exact length you want, then debure / "crown" the inside of the fresh cut, so that there's no burrs inside the tip. Don't take off too much material, just enough so that there's no burrs / obstruction at the tip. You can use a fine "pointy grinding tip" on the Dremel to do this. Try not to score the inside of the barrel.
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