Make sure to watch my Vimeo video for this Comparison Review as I go into a lot of detail about the similarities and difference with each of these CO2 Blowback Pellet Guns.

Here are some of the main Similarities when comparing the Sig Sauer P250 & P226 - Umarex PX4 Storm - Gamo P25 & MP9:

• All of these CO2 blowback pellet guns are made for each company in Japan (I am assuming from the same factory?)

• All of the listed Pellet Airguns shoot .177 caliber pellets (Can be Alloy or Lead)

• They all have double sided rotary stick magazines that hold 8 rounds on each end for a total of 16 shots per magazine.

• All of the Airguns use 12 gram CO2.

• All compared pellet guns have Blowback operation.

• All of these pellet pistols have single and double action triggers except for the Gamo MP9 which is single action only and needs to be charged on the first shot.

• They all have rifled barrels.

Here is where we find some key differences between these CO2 Blowback Pellet Pistols:

The FPS Velocity for each Airgun:

• Gamo P-25 - 450 BPA Platinums.

• Gamo MP9 - 450 BPA Platinums.

• Umarex PX4 Storm - 380.

• Sig Sauer P250 - 400 with 5.25 grain.

• Sig Sauer P226 - 400 with 5.25 grain.

The weight of Each Pellet Gun:

• Gamo P-25 - 1.7 pounds.

• Gamo MP9 - 3 pounds.

• Umarex PX4 Storm - 1.6 pounds.

• Sig Sauer P250 - 1.45 pounds.

• Sig Sauer P226 - 2.35 pounds.

The Barrel Length for each Air Pistol:

• Gamo P-25 - 4.5 inches.

• Gamo MP9 - 6.5 inches.

• Umarex PX4 Storm - 4.5 inches.

• Sig Sauer P250 - 4.75 inches.

• Sig Sauer P226 - 4.75 inches.

The Main Build Materials for each Pellet Pistol:

• Gamo P-25 - Metal slide with plastic frame.

• Gamo MP9 - Plastic outer shell with lots of internal metal parts.

• Umarex PX4 Storm - Metal slide with plastic frame.

• Sig Sauer P250 - Metal slide with plastic frame.

• Sig Sauer P226 - Metal slide and frame. 

Is the Ejection Port Cut Out?

• Gamo P-25 - Yes.

• Gamo MP9 - No.

• Umarex PX4 Storm - Yes.

• Sig Sauer P250 - No.

• Sig Sauer P226 - No.

Is it a Replica of a Real Steel Gun?

• Gamo P-25 - No.

• Gamo MP9 - Yes.

• Umarex PX4 Storm - Yes.

• Sig Sauer P250 - Yes.

• Sig Sauer P226 - Yes.