Description
The Maxim Defense PDX-SD is an ultra-compact 5.56 NATO pistol on Maxim's PDX platform, with the SCW system and a 1/2×28 threaded muzzle.
The SD designation is about what it is built to run. Maxim make a dedicated DSX suppressor for the PDX – shorter and larger in diameter than a conventional can, with no barrel-length restriction, integrated carbon cutters, and user-serviceable with common tools. Maxim describe it as reducing gas blowback and holding the cyclic rate down compared with a conventional suppressor on the same host.
THE SUPPRESSOR IS SOLD SEPARATELY. This listing is the firearm with a threaded muzzle. A suppressor is an NFA item in its own right. Since 9 October 2026 it transfers on a Form 4473 with a NICS background check, the same as any other firearm, and state law may still restrict or prohibit it where you live. Since 9 October 2026 the ATF no longer enforces NFA registration or approval for suppressors, and the transfer tax has been $0 since 1 January 2026. Check your own state law, which did not change.
Configured as a pistol, it stays a pistol. Fitting an actual shoulder stock to a firearm with a barrel under 16 inches makes it a short-barreled rifle – an NFA item that must be registered and approved before it is assembled, not after. If you are unsure what you have, ask us first.
This is a serialized firearm. It ships to a licensed dealer near you rather than to your door, and you complete the transfer there with a Form 4473 and a background check. State and local rules govern what can be shipped where, so check yours before ordering – and if you are unsure, ask us first.
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