The Beretta PX4 is a high quality DA/SA hammer fired handgun. It is extremely reliable and with low recoil flip due to its rotating barrel lockup rather than the typical tilting barrel. Good as it is, Langdon Tactical offers a number of upgrades ranging from parts to complete pistols with custom triggers, safeties, and other goodies. Many of these upgrades are available as drop-in replacement parts.
I bought three of the minor upgrades, an 11# PX4 Chrome Silicon Hammer Spring, the Optimized Performance Trigger Bar, and the Stealth Lever Kit.
Langdon sells a range of hammer spring weights. 11# is the second lightest, which they recommend for all ammunition. Their 10# unit is recommended for American factory ammunition only as some European ammo has harder primers.
The effect of the 11# spring was to lower the double action pull from 10 pounds to 8-1/2 pounds. The single action trigger pull went from 5-1/2 pounds to 5 pounds. Both were noticeable differences. The new spring has functioned flawlessly.
As a Langdon video shows, on new guns it helps to “burnish” the hammer/sear surfaces by dry firing the pistol a few times while pressing on the back of the hammer. On mine this dropped the double action pull from 10-1/2 to 10 pounds all by itself.
The new trigger bar improves the trigger reset from about 0.24 inches to 0.07 inches. This helps a lot with split times.
The PX4 is a fairly large gun which helps with recoil and target reacquisition but makes it somewhat bulky. The two ambidextrous safety ears on the factory gun stick out making the gun even bulkier. Langdon’s stealth decockers are essentially flush to the slide and much easier to operate. They convert the standard PX4 to decocker only. As a carry option this eliminates the need to switch off a manual safety. Beretta offers a similar version of the PX4 but their levers still stick out.
Earnest Langdon makes these installations look easy in the videos on the Langdon Tactical web site but if you decide to do this you will want to watch their “Trigger Job in a Bag” video several times. For both you will want to study exactly how the trigger bar fits into the hammer/sear assembly in your gun before you start. There are also videos on the Langdon site and YouTube for the stealth decocker installation. Alternately just take it all to a gunsmith.
I bought the adjustable target sights from Beretta. These DEFINITELY require a gunsmith as the factory dovetail fixed sights are way too tight for ordinary tools.
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