The .357 Desert Eagle has a larger MAGAZINE capacity than 7, and the slide doesn't have to lock back in order to reload another MAGAZINE. You can load another MAGAZINE into a semi auto pistol and would allow you to have all the rounds in the MAGAZINE along with the round that is chambered (Gving a +1. For example a 1911 and .50 Desert Eagle could have 7+1, Glock 17 could have 17+1, M9 could have 15+1, etc.). Also why does the extractor on the Glock slide stay with the barrel? It moves along with the slide otherwise the brass wouldn't extract.
Then there's the fact that if they were FULLY workable, you could lock the slide back on the Glock, pull the disassembly tab down, and release the slide to do a field strip; removing the MAG from the frame, and recoil spring and barrel from the slide. Basically, it's clear that the flash artist who made this doesn't have much if any hands on experience with these firearms, and the fact he calls the MAGAZINE a CLIP makes it abundantly clear... There IS a difference, and I can tell you the Glock, Desert Eagle, 1911, CZ75, M9, P38, M4, M16, G36, 10/22, Luger, TT33, M1895, Hi Power, and AA12 are NOT designed to accept CLIPS.
I'm sorry but I feel like smacking someone upside the head every time they call a MAGAZINE a CLIP. The Kar98k, M1 'Garand', M91/30, Carcano, C96, Steyr 1912, and M1903 have fixed internal MAGAZINES in which CLIPS are meant to switfly load them. The M1 and Carcano use En Bloc clips that go in the magazine with the rounds, while the rest of those firearms use 'stripper' or 'charger' clips that are discarded or put aside after loading the rounds. The Lee Enfield and K31 have detachable external mags, but are traditionally loaded with clips. Removing the mag is typically only done for the sake of cleaning.
Back on topic; the .357 Desert Eagle should be able to use 9+1 if I'm not mistaken, and the compact Glock in the video should also be able to go +1. I don't know off hand what the magazine capacity is, but if you load a fresh MAG into the frame while a round is still chambered, that gives you one extra round on top of those in the loaded MAGAZINE. Have a mentioned that it's called a FRIGGIN MAGAZINE?!
Also .357 Magnum uses the same diameter bullet as 9mm, and only has about 500 ft/s more velocity on the same bullet weight (Less than 50% more powerful, perhaps around 35-40%). The fact that the Desert Eagle design is FAR larger and heavier than a compact Glock would mean that it's better at absorbing recoil, so the difference between the two wouldn't be substantial. I shot a .44 Magnum revolver as well as a .44 Magnum Desert Eagle before, and I can tell you the Desert Eagle with its heavier weight and moving parts had a lot less felt recoil. It's also a lot less accurate, and a lot more prone to jamming. You'll NEVER find me wasting money on a Deagle, I'd much prefer a revolver, but I digress.
In summary; reduce the noise/recoil of the Desert Eagle, fix the slide on the Glock so the extractor isn't left behind, allow the ability to reload without locking back the slide if there is a round still in the chamber, give the ability to go +1 capacity, give the .357 Desert Eagle a 9 round capacity, FIX THE AUTHOR COMMENTS SO THAT IT SAYS MAGAZINE INSTEAD OF CLIP TO REFRAIN FROM LOOKING LIKE AN IDIOT WHO HAS NEVER TOUCHED A GUN IN HIS/HER LIFE, and for extra points give the ability to field strip the designs.
I'll also add that if you truly want to make it opposites, give the Desert Eagle .44 Magnum or .50 AE, as .357 and 9mm use the same diameter bullet (Bullet thickness). Well, a TRUE comparison of opposites would be full sized revolver vs. compact semi auto pistol, because those are two semi auto pistols in the flash, but they still have the difference of Deagle being gas operated and Glock being recoil operated so that's negligible. Make the aforementioned changes of the paragraph before this one, and I more than likely would have given it a 4 or 5 stars. Field strip would DEFINITELY get 5 stars. Better luck next time.