This magazine adapter is the only product on the market that will permit the use of a PX4 .45 ACP mag in the CX4 .45 magwell. While SierraPapa is known for providing metal replacements for plastic stock CX4 parts, there are times when plastic is the right material to use. In the case of this mag adapter, 3D PLA printing produced a thin, flexible, but sturdy adapter that hooks securely into your mag well and drops the mag out freely when the accompanying mag release button is pressed. The optional SP release button is slightly longer than the stock button, and its increased length and grippy surface improve feel and function over the shorter, more slippery stock part.

8045 mags can be very difficult to come by, and this PX4 magwell adapter adds flexibility to your CX4 45 set up and is especially suited to those who already own a PX4 45.