Caliber Compatibility

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. While our upper receiver is designed to fit both the 0940 and 1045 lower receivers, a upper built for .45 ACP will not work with a 0940 receiver for example. 

If you have any further questions about caliber compatibility please contact our support team.

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