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Hi Lyman and welcome. Yes, Tisas PX 5.7 magazines are proprietary. This means they are specifically designed for the Tisas PX 5.7 pistol and are not interchangeable with magazines from other firearm models. The Tisas PX 5.7 uses a 20-round, steel magazine with a proprietary design. Cheers and stay safe!

Yes, they are "Proprietary" & and simply means they are not completely with any other models.

Good morning to you!! The TISAS PX-5.7 RAPTOR 5.7MM has a proprietary magazines that is made specifically for the Tisas PX5.7mm pistol. Hope this helps. Have a good rest of your day.

proprietary magazine