Instead of buying the special Lone Wolf barrel, wouldn't it be easier to swap out the G19 locking block with the G17 version? This way you'd be able to use the factory G17/G17L/G34 barrel.
I currently don't have one of each on hand to check whether this is feasible.
Just get a G17, and have me cut the grip down to G19 or G26 length!
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