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New numbers on the PPQ with the 6 inches barrel and 0.51g pellets after adjusting barrel/pellet/valve for better alignement: (fps) (Joules) 473 5.31 J 469.6 5.22 J 469 5.21 J 462.4 5.07 J 457.8 4.98 J 441.8 4.62 J 426.7 4.33 J 423.1 4.26 J 5.31 joules at peak ! The first...

I actually wrote "g" everywhere, as in grams, not grains. Not sure where you saw grain mentioned 😅 But yeah, 0.45 g is about 6.9 gr.

Barrel extensions work really well on fixed-slide, non-blowback models, but that’s generally not the case with blowbacks like these. If the slide starts opening and the CO2 is redirected backwards into the system before the projectile has exited the barrel, it actually slows it down due to a...

Glad it helps ! Do you have the Glock ? Are you planning to do the same ? Be careful with the valve or the magazine head. Spare parts for these models are not available, and it’s easy to mess things up completely. Take a close look at the part beforehand to know where you can safely remove...

Machining complete ! I ended up installing it on the umarex PPQ M2 Q4 tac combo, since it's equipped with a suppressor that can hide the extra 4cm/1.6 inches of barrel. Even though it has similar mods on the magazine and valve, and slightly higher out of the box power, the results are a...

Next step: long barrel ! The original is 11 cm (about 4.3 inches), and considering the CO₂ cloud it releases after the modifications, I'm sure it can benefit from a longer one. The new barrel is a 15 cm, taken from a 6-inch barrel of the Crosman Triple Threat. As long as it’s not too long, it...

This Umarex Glock 17 features a 21 shot chain magazine and delivers 350 fps with 0.45 g pellets out of the box, which equals 2.56 joules. This is low, but still within the standard range for a .177 blowback pistol. Its stock performance is below the PPQ M2 Q4 from the same series that also use a...

Thanks for your message ! You’re absolutely right. But i recommend similar modifications to anyone capable of doing them. They really make a world of difference, and the gun remains very reliable even when fully modded. I believe it could even benefit from a longer barrel and potentially reach...

Hello, With over twenty years of experience modifying airguns I turned my attention to the Umarex CP99 pistol and managed to reach a power of 7.5 joules ! To my knowledge, it is now the most powerful CO2 multi-shot pistol in .177 caliber. This result is the outcome of many years of fine-tuning...