.177/.22 Cal | 1/2 x 20 THD |KOI| 1.22 x 7" | with Cone Endcap
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With a rugged front cap design, signature DonnyFL body grooves and bolt endcap, the KOI is a great addition to any shrouded or un-shrouded air rifle. It has the smallest outer diameter compared to the other DonnyFL models but don’t let the size fool you, it's as impressive as the others!