Madbull have their Steel Bull tight bore barrel back in stock:
RE-introducing the long awaited Steel Bull 6.03 mm steel tight bore barrel. This popular-by-demand item is back in stock and back in action. Significantly increase your shot grouping, FPS, and accuracy, all while reducing wobble. Once again you can posses the performance of MadBull’s Steel Bull tight bore barrel.
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(Madbull)
