PCC Lower Receivers – 9mm, 10mm, .40 S&W & .45 ACP

Start Your Pistol Caliber Build with MA-9 & MA-45 Lower Receivers

Shop PCC lower receivers for pistol-caliber AR configurations at Moriarti. Browse lowers for 9mm AR-9, 10mm AR, .40 S&W AR-40 and .45 ACP AR-45 platforms, including stripped and complete configurations where available. PCC lowers may differ in magazine compatibility, LRBHO configuration, receiver design and caliber support, so review each product's specifications carefully. Available options include dedicated pistol-caliber receivers in multiple materials, styles and finishes.

What should I check before choosing a PCC lower receiver?

Check the receiver's stated caliber and magazine compatibility, along with its lower-parts compatibility and whether the configuration supports last-round bolt hold open (LRBHO). PCC lowers are not universally interchangeable across 9mm, 10mm, .40 S&W and .45 ACP configurations, so the individual receiver specifications should determine compatibility.