Caliber Compatibility

Understanding caliber compatibility is crucial for firearm customization and we're here to help you navigate this complex topic. By knowing which receivers are compatible with a variety of calibers, you can personalize and optimize your firearm with confidence and precision.

The 0940 lower receiver is designed to accept 9mm, .357 SIG and .40 S&W calibers. The 1045 lower receiver is designed to accept .45 ACP and 10mm calibers.

Our upper receiver is designed to accept pistol calibers only and will work with both our 0940 and 1045 lower receivers.

With a firm grasp on caliber compatibility, you are now equipped to enhance your firearm according to your specific needs and preferences. Happy shooting!