Armor Games

That's approximately what the boxes look like if you compare with the game. M is the green box. O is nothing. X is a crate. for that picture.

Which Deagle challenge?

Skill is in the first post.

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how do you get expert on the m1a rifle skill challenge?

For M1A you actually have to aim higher than just above the box and it should roll off and be trapped between the platform and a crate at an angle.

The picture you put up isn't exactly like what the level is. It should look like this for the M1A:

X
0
00 _____
000
000

The speed challanges all seem to have a problem of a nessacary reload, which makes it take to long even at the fastest(Deagle and USP in paticular)

Deagle should be doable with Gun Newbie and Novice, though you don't need both if you can fire as fast as possible and not miss.

Armor Games definitely got the easier version. On another site, it's 3 seconds instead of 4 for the USP. If you unlocked Gun Newbie (Played for 30 minutes), Novice (Earn 57 Novice Medals), and USP Ninja (Sling 400 USP Rounds) then you should have 19 rounds, more than enough.

secondly, is there a faster way to unlock the spas? it takes too long as each shell isnt counted but the shot counts as one shell

The Kar 98k is even tougher with more than twice as many rounds needed and a slow reload, but unlocking that one gives you a 1 hit weapon. ;) For those that aren't automatic and have relatively slow reload, a touchpad is nice so you don't have to kill your fingers on a mouse. Other than that it's click-spam.

But there should be enough time for every speed challenge even if it means that you can't miss a single shot.

When I play the game, it looks like this:
x
0  0_____
000
000
Is it a glitch or something?

I'm not sure, but that configuration is impossible. There's no way you can get the box to fly over that bump and onto the platform with just one bullet. Have you checked other sites to see what the configuration is? (M1A you don't need to unlock so it shouldn't take too long.)

Is there any trick to the Micro-Uzi Speed Challenge? I need Expert on it to unlock the last gun, so I can't get the Novice bonus yet.

Spam and hope you don't miss from the top down. If you're lucky enough, a bullet you fire could hit a bullet that missed so that both hit two different targets and you haven't wasted any shots. You have 22 bullets? Reload should be fast enough (~1 second) for you to recover so that you can complete the challenge before the game ticks over to the next second.