The APA Fat Tuna and Little Tuna is a product of a partnership between APA and Adaptive Tuning Systems (ATS).
The APA Fat Tuna attaches directly to the APA Fat Bastard and the APA Little Tuna attaches directly to the APA Little Bastard.
Simply replace your existing jam nut with the Tuna nut and you’re ready to start finding the node your ammo wants. Whether your barrel is speeding up post break-in or temperature swings have influenced your load at a match.
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