You can't unless it's certain shot guns. It's caused by you spectating a person while they have almost finished realoding but the game on your screen shows the entire reloading. So basiclay it's a lag/delay in the game(mw2)
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you dont.
no u have to have a single shotgun handgun or watever to aim down the sight
If you are meaning ADS it means aim down sights and when you get sleight of hand pro it means you can aim down your iron sights faster than normal. Good for quickscoping.
It actually depends what kind of sniper, but the recently updated snipers you press Z while in first-person in ROBLOX.
aim down sights, read the book