I don't think this is really the right place but...
I believe barrage weapons have a G## in the summary for range, the G signifying guess which is now barrage. If you aren't sure, you could just remember which weapons in your army are or aren't barrage, or look up the full rules.
And if you read the rule book (of course you should have done so first...) it really answers both of your questions. Yes they cause pinning, but next time go look up the rule book yourself, don't be lazy, I have homework to do, and this is a waste of my time. If you don't have one, get one.