You might want a tad more for accuracy reasons. Also if gas operated you need enough for proper function.
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Where did I mention hunting ??
MT1, et al,
I was incorrect. My High Point 4595 has a barrel length of 17-1/2". Removing 1-1/2" now looks like a viable option.
A Bullpup conversion and shortening the barrel by 1-1/2" will reduce the OAL to 25-1/2" (from 32").
BTW, if hunting was in my future, I sure wouldn't be using a PCC. My 7mm Magnum worked fine for anything I'd encounter in NA when I was hunting.
Tax stamp ???