I've had the Guarder/TM hard kick version for years and in polished chrome of course. Let's be honest, you don't buy this thing to holster or use as a practical back-up. Indeed the times I gamed it a long while back it was my primary/only with 4 mags of which 2 I believe had 'high flow' valves but I've never noticed any difference on chrono or kick.
With this model/set up as mentioned, you will require 3 stages of something to contain your sploog: one for when you see it, one for when you hold/reload it, and one for firing it.
It has the Guarder full metal slide, frame, safety catches, and barrel/chamber kit (CNC aluminum). Enhanced recoil springs (DE has two) to compensate for weight, guide rods, and enhanced hammer spring. Steel front and back sights as well.
Wait for it.... Wait for it....
It's the full trademarked version of the kit! That means no cheesy "Tokyo Marui" or "Made in Japan." The trades aren't cheesily painted on either. I don't have it near me right now but it's got ".50AE" where it should be. "Desert Eagle" and trademark and "Magnum Research Minneapolis, MN" on the slide. And "Made in Israel" on the frame as well as a unique serial number. They're all very nicely engraved.
The weight is obviously amazing. I've never held a real one nor have I weighed mine myself but according to stats for both, they're not off by much.
This is the best GBB I've ever laid my hands on in in terms of build quality as well. No creaks, cracks, scratches or wobbles. It's solid as a brick and you could probably do more damage throwing this at something than an actual brick.
Functionality wise you can't ask for more. I've never had it jam. It's never crunched a BB. It's never misfired. Due to the size of the mags you get plenty of gas mileage out of them. Easily a full mag firing as fast as you can assuming you gave it time to warm. When you use it as your only then you're going to be conservative with your shots anyway. I have easily had over two full mags go through it in moderation with a little to spare. Those "high flow" ones just seem to give off a tiny bit of excess but not even noticeable in practice. As long as it gets one full mag worth off without hiccups it's fine by me.
The range, accuracy, and power of this thing are significantly better than any stock GBB. I'm not going to say 'what it can go up against' since when I play I'll use anything against anything. You'll feel extremely confident firing it out to 20m+. It can be a bit hard to aim but the sights are quite practical and pleasant.
Seems like some of you are extremely new by the mention "this obscure green gas." Green gas is just propane in an incredibly unsafe and overpriced can. I've never had a can of it ever. Look up the AI propane adapter. All you need is that and as many $4 camping propane tanks from the store you want. And some lightweight silicone oil
Price wise....well this is a nightmare to compute. So I won't and I'm not sure you can even get some of these parts anymore. Let's just say it's several times the ballpark of anything mentioned here. It was also a mostly pre-build from overseas too, so there's that. Starting with a stock TM DE now it's probably going to run you over $1000
You can't put a price of peoples' faces when they see it though whether it's in their hands or pointed at them. This gun is the epitome of bad ass ridiculous hand cannons (for airsoft anyway). I'm just happy I got a solid product that's as equally wall-hanger worthy as it is practical.
Now the Achilles heel of this thing
The mag catch was not upgraded from whatever TM uses. So given the crispness and sharpness of the slide and the pressure of the stronger recoil springs it wore off the nub of the slide catch in just a few mags. It still functions if I push it up when locking the slide back but during firing to empty it won't lock back thus you must remember your shots or at least check your mag often (not all bad since it gives you more reasons to slide it in and out). Sucks though because watching a DE fire to empty is one of the assiest parts of the badness. Luckily there does seem to be a steel slide catch out there but it's going for $32 USD overseas alone for fuck sakes.