Umarex [UMAREX] Glock 17 Gen 5 Tuning : Power Upgrade – Almost 7 Joules!

[Clark33]

Thank you so much i will waiting , and i want this modification can get max joules if you can more then 5 and thanks

Know that It’s not possible to exceed 4,5 joules without using a long barrel. That’s the maximum I was able to achieve with the original barrel
after modifying everything on the magazine. The data and a video are available in the first post

 

[Clark33]

Damn, really cool.

I’m currently deciding on getting either the Umarex G17 gen 5 MOS .177 pellet or the 4.5mm BB version.

I’ve been reading that you can’t field strip the pellet version - how did you get the slide off to replace the barrel? If the slide is removable then I’m definitely going to get this one and try and follow what you did. Really interested in modding it but I’m concerned that it might not be as easy as the BB version which has upgradable hop ups, barrels, etc.

Thanks!

On the pellet version, you can remove the slide very easily you just need to push out the front pin, pull the slide back, then lift it up and it comes off. You can do that in less than 20sec. To change the barrel however, you'll also need to push out the rear pin to remove the entire internal mechanism : barrel, trigger, and hammer, which are all held in place in the plastic frame. It might seem intimidating at first, but I was surprised by how simple the mechanism is, there are actually very few parts. A hammer, sear, trigger bar and a trigger that has the rotating finger attached directly to it, which rotates the magazine chain https://streamable.com/uu1t35

Inside the slide, the blowback system is screwed in and contains a seal and the firing pin in the center. I find it very well-designed and clever, despite Umarex usual and unfortunate use of zamak and other alloys. Still, it seems reliable and durable overall. It’s a really cool Glock to modify. Another advantage is that it works in both single and double action, meaning you can disable the blowback and still shoot without having to manually rack the slide after each shot. In theory, that could increase power slightly, but I haven’t really tested it myself as I’m not interested in that.

Be careful though, its not a drilling job but a sculpting job, if you're not handy or don't have the right tools :i recommand a flex shaft grinder with a foot pedal, 1mm to 1.25mm carbide corn end mill for the valve and 6mm ball end mill for the magasine head. You’ll need to be precise when working on the valve which is tiny and in steel, or the head of the magazine. It’s easy to break something or remove too much material and pass through by mistake. Since spare parts aren’t available, you'd have to buy a new magazine.

But if you're into tinkering, it's a lot of fun. I don't have the BB version, but it’s obvious the pellet version is far more accurate. With my long barrel, it's very precise. It also has the benefit of holding more shots, and you can use specialty pellets like the H&N Hornet pistol with brass pointed tips for plinking.