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Hi Mark and welcome. Yes, a 4.6-inch threaded barrel will fit the Walther Arms PPQ Q4 T no issue. Cheers and stay safe!

Good evening to you!! Yes, many Walther PPQ and PDP barrels are interchangeable, but not all. In general, the 4-inch barrels and some other barrel lengths are compatible between the two models. However, the PPQ SC and the PDP F series have specific barrels that are not interchangeable with other PPQ or PDP models. Key points to consider: Barrel Length: The most significant factor in interchangeability is barrel length. 4-inch barrels, for example, are commonly interchangeable between PPQ M2 and PDP models. PPQ SC: The PPQ SC (Short Compact) has a shorter barrel and recoil spring, making it incompatible with standard PDP barrels. PDP F Series: The PDP F series, with its 3.5-inch barrel, is also not compatible with standard PPQ or PDP barrels. PPQ and PDP Compatibility: PPQ and PDP slides and frames are generally interchangeable, allowing for a variety of configurations. Older PPQ Models: Some very early PPQ models (before serial number FCA0001) have a slightly different barrel geom

Yes, it will fit and function properly.