The Langdon Tactical Beretta Px4 Full Size 9mm is a factory Px4 Storm reworked by Langdon Tactical for a red dot (LTT part no. PX4FFONRR). The slide carries LTT’s proprietary RDO optic cut, which mounts an adapter plate machined for the Trijicon RMR footprint with a backup rear sight built into the plate itself and matched in height to the front sight. Underneath it is the Px4’s rotating-barrel action, a locking system that turns the barrel about 30 degrees on firing instead of tilting it, which is a large part of why the platform shoots so soft for a polymer duty pistol. A 4-inch stainless steel barrel, a 15+1 magazine and ambidextrous controls keep it in the full-size duty and home-defense class. It is a ready-to-mount answer for shooters who want the Px4’s recoil behavior with a modern optic and no gunsmith wait.

Key Specifications

• The chambering is 9mm Luger, the standard duty cartridge for a full-size double-stack pistol.
• Magazine capacity is 15+1, the full-size Px4 count that keeps the grip proportioned for two-handed shooting.
• The barrel is a 4-inch stainless steel tube, the Full Size length that balances sight radius against holster carry.
• The action is double action / single action, with a longer first pull followed by a lighter single-action trigger for follow-up shots.
• The Px4 uses a rotating-barrel locking system, which spreads recoil over a longer impulse and keeps the muzzle flatter than a tilting-barrel design.
• The slide is optics ready with LTT’s RDO cut, fitted with an adapter plate for the Trijicon RMR and SRO footprint.
• A backup rear sight is integrated into the optic plate, sized to the front sight so the irons work through the window if the dot fails.
• The slide carries serrations for positive manipulation with wet or gloved hands.
• The frame is black polymer with a Picatinny accessory rail, ready for a weapon light.
• Controls are ambidextrous, with a firing pin block and manual safety lever accessible from either side.

Frequently Asked Questions

Which red dots fit the optic cut? The LTT RDO plate on this pistol is cut for the Trijicon RMR footprint, which also accepts the Trijicon SRO. Plates for other footprints are sold separately by Langdon Tactical and only work with the LTT RDO system.

Do I lose my rear sight when I mount an optic? No. Langdon Tactical builds a backup rear sight into the adapter plate, matched in height to the front sight, so the irons remain usable with a red dot installed.

What makes the Px4 different from other polymer 9mm pistols? Its rotating-barrel action. The barrel turns to unlock rather than tilting down, which softens the recoil impulse and keeps the sights flatter during rapid fire.

Buy the Langdon Tactical Beretta Px4 Full Size 9mm, Optics Ready, RMR Footprint

A Px4 with a red dot used to mean shipping the slide out and waiting. Langdon Tactical delivers the cut, the plate and the backup sight as one finished package, so the only thing left to add is the optic. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse the rest of our semi-auto handguns while you are here.