If you're not picky about look a HI CAPA 4.3 tight bore barrel will in the px4 fine. Only when it locks back will the barrel protrude slightly from the outer barrel, otherwise it fits without sticking out. The extra barrel length will get you some FPS.
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The ultimate measure of a man is not where he stands
in moments of comfort and convenience, but where he
stands at times of challenge and controversy.
- Martin Luther King, Jr.
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