Palmetto State Armory PX9 Gen4 AR-9 Micro Pistol, 9mm, 4" Nitride CMV Barrel, Glock-Mag Lower, M-LOK, SB Tactical Brace, 33+1
This PSA PX9 Gen4 is a compact 9mm AR-pattern pistol built around a dedicated Glock-pattern lower and a slick-side billet upper. It features a 4" nitride-treated chrome-moly-vanadium barrel, a short free-float M-LOK handguard with a continuous 1913 top rail, and a forward-directing fluted flash-can recessed under the handguard. An SB Tactical brace, Magpul polymer grip, and included 33-round magazine complete a well-specified, US-made AR-9 package.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm is in great shape. There are some minor and superficial scratches and blemishes present.
What’s Included
- PSA factory cardboard box with end label
- 1x 33-round Glock-pattern extended magazine
- QD sling swivel installed at receiver endplate
The Gen4 PX9 uses a straight blowback system paired with a 4" chrome-moly-vanadium steel barrel that is nitride treated and cut with a 1:10 twist. This setup delivers a compact footprint while maintaining durable, corrosion-resistant barrel construction.
The slick-side billet AR-pattern upper deletes the forward assist and ejection-port cover and mates to a short free-float aluminum M-LOK handguard. A continuous 1913 top rail runs from the receiver across the handguard, and the fluted, forward-directing flash can is recessed inside the handguard for a clean profile.
The dedicated PX9 9mm lower is designed for Glock-pattern magazines. PSA documentation notes the design does not provide last-round bolt hold-open. Controls include a standard right-side magazine release and a manual safety with SAFE/FIRE selector markings, along with the Palmetto State Armory crest on the magwell.
Ergonomics and support are handled by an SB Tactical pistol stabilizing brace on a round pistol tube and a Magpul polymer pistol grip. A QD sling swivel is installed at the receiver endplate for quick sling attachment.