I watched the video but have a question as to how to pressurize the power chamber. Anyone know how this is done.
Pre charged pneumatic air rifles can be filled by way of a high pressure hand air pump, much like a typical bicycle pump, but the internals are multi-stage, capable of generating over 3000psi. That's how I do it with the two PCP airguns in my small collection of air rifles. It takes about 100 pump strokes to fire off about 35 good shots (900fps or better). It's a workout if you are having a target session, but hey! We all need more exercise.
The most popular fill option is to purchase a high pressure tank. the self contained breathing air tanks such as fire fighters use. These tanks will refill the rifle's smaller reservior many times. These portable fill tanks are common with the paintball crowd and can be filled at a paintball specialty outlet, a SCUBA dive shop or even at times, at your local fire station. (bring donuts!) Fills are around $10 and good for hundreds if not thousands of shots.
The "investment" option is to purchase a motor or engine driven high pressure air pump such as the "shops" might use to fill your tanks. These run in the thousands of dollars but you never run out of air.
There is a popular lower cost option called the "Shoebox" compressor (look it up) about $600, and a little slow to fill a storage tank.
Another method is to purchase or lease an industrual 4500psi cylinder of NITROGEN, (not oxygen) Air is about 80% N2 anyway, and a big cylinder lasts a long time. The annual lease price in your area will determine if it's a good choice for you. The local Airgas here wants a ton of money to stand one of their tanks at my place ;-) If you used Helium, the muzzle velocities could be pushed WAAAY up, but that's a different topic.
So that's what I can tell you about filling PCP air guns. For a field outing, I do like the PCPs, as the performance can be similar to a typical .22 rimy. For plinking and rodent control off the pourch, I choose the single stroke springers One stroke, one shot one kill. (I've got 5 different versions of this type)
CO2 and multi stroke pneumatic (think classic Crossman) are fun as well, The CO2 is "too" easy", and the multi stoke is a lot of work if you are shooting much.
Biggest benefit to airguns for me? they can be quiet, the sound doesn't draw the attention the way powder burners do, and the pells have rotten ballastic coefficients. They just loose a lot of velocity with distance. That's a good thing! The pells don't carry so far beyond the inteded target.
The Mauraders (Mrods) are very popular and a good buy for the money. (I choose the Evanix AR6 in both .17 and .22 just to be different. They are revolver actions ;-)
cheers