HAS ANYONE EXPERIENCED POI CHANGES AFTER BARREL SWAPING ON THE G2 CONTENDERS?IF SO WHAT DID YOU DO TO CORRECT IT OR HAVE BEEN TOLD WHAT TO DO TO CORRECT IT.I AM INTRESTED IN BUYING A G2 BUT AM LEARY AFTER READING POSTS THAT TALK ABOUT POI CHANGE AFTER SWAPING BARRELS.I KNOW MOST HAVE BEEN ABOUT THE ENCORE,BUT WONDER IF THIS IS A PROBLEM WITH THE CONTENDERS.ANY HELP ON THIS MATTER WOULD BE GREAT.I PLAN TO PURCHASE A RIFLE IN THE NEXT FEW MONTHS IF I KNOW THAT THIS PROBLEM IS EASY TO CORRECT.