I agree with you EpsiloN.... and i think you are talking about the black pins right ?
The pins are a really hard target at 100m, almost impossible !!
With pistols or submachineguns forget it! you need to shoot like crazy to hit something...
With Rifles and the carbines you can hit some if you train a lot.... (my case...imagine how much i shot to fix the weapons´s sights !!)
And with sniper rifles using the scopes you may be able to hit without getting nervous ! hehe!!

But dont worry...i know and agree,those pins at that distance are not normal targets. They are just a little bigger than a Coke Can....
If you press F1 , it will load another level and the pins are a little closer... and using an Ak-47 at that distance you cant miss it!!!!! No excuses !! hehe!!

Thanks for the observations!!!