First off, I would like to thank Den Trinity for their speedy shipment of these items to me. Lets get down to business.
Marui XL BB Loader:
View nice piece, in my opinion. The loading of the bbs into the magazine is smooth, right down until the magazine is full. The button you press down to force BBs in the magazine is nice and stout, and I don't think it will break very easily. When you push the loading button down, you can lock it into place with a switch(like a bb release mechanism on magazines), instead of a button. Loading of the bbs into the loader is kind of a pain in the ass. The loading "port" is kinda small, unfortunately. The port is right next to the button, and it slides open like a little hatch. Flip it over and you will see the loading nozzle. Pretty basic. Next to it a pistol adapter is on a hinge. It flips over and covers the nozzle for loading of a pistol. When not in use, it tucks into the magazine. I think its kinda cool, instead of having an adapter that you can lose. It also included another adapter, but I'm not quite sure what it was intended for, I'm sure I'll figure it out in the future. The loader itself does hold roughly the suggested amount of 450 BBs.
Pros:
Holds 450 BBs
Smooth loading
Pistol adapter tucks into magazine
The size of a marui M16 magazine
Cons:
Small BB loading port
King Arms Hi Capacity Loader:
This is an interesting piece. It has a very ergonomic shape. Loading BBs into it is a snap, much larger than the Marui XL, or even the SRC/Marui standard loaders. The button sticks up nice and high, which could lead to an accidental breakage, but it looks pretty sturdy, so I'm not worrying about it. Loading BBs into the magazine is a rather smooth operation, didn't have to shake it like you do sometimes with the normal BB loaders. This piece is much larger than the normal loaders, and holds 200 bbs, roughly. It is actually bigger and longer than my real Glock 17 magazines It does have an adpater, but unfortunately, there is no way to secure it to the loader, so you might lose it. It also came in cheaper than Marui and SRC loaders, which is a plus, considering it holds more ammo.
Pros:
Cheaper than most loaders
Holds around 200 bbs
Ergonomic design
Cons
Big and long
No way to secure adapter to loader
If you have any questions reguarding any of these items feel free to PM me, or post them here.