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Bar-sto barrels are 2 piece, like all FN HP barrels.

The reason for this according to Bar-Sto is that the different, opposing grain structure they use in making the bottom lugs, makes for a stronger barrel.

Apparently some one piece barrels made in years past by FN (and Bar-Sto) sheared the lower lug prematurely.

I have heard reports of Bar-Sto's separating tho.

KKM precision barrels are one piece, and are the preferred barrel of Kurt Wickmann, who has worked on more HP's than anyone.

Oly Arms barrels are drop-in, but look decent for the money.

Kart needs to get in the game. A 4350 CM Kart one-piece would be quite tough indeed.
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