Jack is basically a more basic, air efficient, entry level HPA system P* made for people who want to get into HPA and also give an idea what the F1 will be like (F1 is a project P*'s working on). Main difference is obviously the size and universal compatability. With the jack (and correct nozzle) you can basically fit the thing in anything you want. Scars, Mp5s, MP7s, M4s, etc. Fusion took special tech work and even 3D printing to work in a unique AEG gearbox like a P90 or Mp7. So overall, Jack is a more easy maintaining, air efficient, less costing P*. I say it is a better entry level choice over the whole Fusion engine system because there's so many options and settings that you'll have to get used to. And for the v12......just go P*. They've been around longer and most techs know about them.

 

Jack is basically a more basic, air efficient, entry level HPA system P* made for people who want to get into HPA and also give an idea what the F1 will be like (F1 is a project P*'s working on). Main difference is obviously the size and universal compatability. With the jack (and correct nozzle) you can basically fit the thing in anything you want. Scars, Mp5s, MP7s, M4s, etc. Fusion took special tech work and even 3D printing to work in a unique AEG gearbox like a P90 or Mp7. So overall, Jack is a more easy maintaining, air efficient, less costing P*. I say it is a better entry level choice over the whole Fusion engine system because there's so many options and settings that you'll have to get used to. And for the v12......just go P*. They've been around longer and most techs know about them.

+1 to ObamasTaxes' comment. I have a P* Fusion Engine and I like it quite a bit. However, it is not necessarily a drop in unit. If you install it in a VFC or G&P M4 or HK416 body, you are good to go. Other brands such as KWA need some modification in order to properly install the unit. I will say this, I have never had a P* FE go down. It is very reliable. I would expect the same from the Jack as well. On top of that, the Jack is even more air efficient that either the V12 or the P* FE without any modifications. As for the Valken V-12, there is plenty information in other threads on this forum about it. The short answer is go with the P* over the V12 every time. P* has an established tech base and multiple user forums to answer questions you may have regarding their products.