Although the X in the bullet is metallic and is part of the core, it works just like the polymer insert of the Winchester USA Ready Defense bullets to prevent the hollow point from getting clogged up and basically turning the bullet into  FMJ. Modern tech.

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BXP Personal Defense is designed for superior personal defense performance in reliability, expansion and penetration. The X-Point is designed to shield the hollow point through intermediate barriers.

X-POINT TECHNOLOGY
Guards hollow point for consistent expansion and penetration. Rapidly transfers energy to the target. Formed metallic hollow point for consistency, toughness and reliability.