I built a Beretta ball gun for CMP matches and used a drop in KKM barrel. I never benched the gun but it would hold the 10 ring at 50 yards. Bottom line is the drop in barrel was capable of shooting high scores at both the 25 and 50 yard line. Unless you are going to spend thousands of dollars to have the gun machined and have the barrel custom fitted, the KKM will serve you nicely.
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