Choosing between an .545 Auto Tactical with a threaded versus a non-threaded version copyrights primarily on what you plan to do. A threaded barrel allows the attachment of a device , most commonly a silencer https://eliteshootersupply.com/shop/fn-545-tactical-threaded-barrel-for-sale/
FN 545 Tactical: Threaded vs. Non-Threaded Barrel Differences
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