Everyone saying Peshmerga will be a problem for Turkey with American weapons have simply no clue about the situation there, first of all KRG is comletely dependant on Turkey, they sell their oil throught Turkey, 70% of Turkish exports to Iraq is actually going to KRG and basically its Turkish construction companys who are building KRG up.
pkk and KRG had always disputes because KRG sees them as a burden as long as they hide there and launch attack on Turkey where KRG gets bombed in return, the only reson why pkk is helping them is because KRG is threaten on its existence by IS without the help from pkk and US and the lifes of their Kurdish brethen is in danger. After IS is crushed the same game will continue, KRG simply cant afford to make Turkey its enemy or they can say good bye to their relatively stable economy.
Not to mention that Peshmerga is not a guerilla organisation and no where a match for Turkish Army, simply too small to be significant.