My upgrade for Umarex PX4 Storm.
Umarex PX4 Storm airgun is one of Beretta PX4 Storm replicas.
With the following Spec:
Model: PX4 Storm.
Materials: Metal slide, composite frame.
Weight: 1.6 pounds.
Barrel: 4.5 inches, steel metal-rifled.
Propulsion: CO2 x 1.
Action: Semi auto, blowback, double and single action.
Ammunition Type: .177 cal. Pellets or Steel BBs 4.5mm.
Ammunition Capacity: 16 rounds.
Upgrades that can be done for Umarex PX4 Storm (Mod / Upgrade):
Chrome + Nickel plated slide
Add Working Slide Lock
Steel Threaded Outer Barrel
Can use both of CO2 and N2O cartridge (see my previous post)
Upgrade FPS : Bore up valve hole/port, weaker spring valve, mod hammer and spring hammer (see pic bellow for comparison before and after mod)
Mod Slide Lock