.40 S&W AR-15 Lower Receivers

Pistol caliber carbines are available in many calibers, including the .40 S&W cartridge. These lower receivers are specialized to accept pistol caliber magazines, and often have built-in ejectors.

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Angstadt Arms 0940 Stripped Upper/Lower Receiver Set – Accepts 9mm & .40 S&W Glock Magazines

Angstadt Arms 0940 Stripped Lower Receiver – Accepts 9mm & .40 S&W Glock Magazines

Aero Precision EPC-9 Complete Lower Receiver 9mm/40S&W

Aero Precision EPC Lower Receiver - Accepts 9mm and .40 S&W Glock Magazines

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Aero Precision EPC-9 AR-9 Lower Receiver – Glock Magazine Compatible