Seriously help, where can I get a .357 Sig barrel for a Glock 27.?

just contact local hunting shop. they will send the gun to gunsmith for modifications. for legal reasons and safety they cannot give you name of the gunsmith. possible gunsmith in your community. check yellow pages. please do not take to a machine shop. it is not a complicated modification. low cost. wise mod. good move. great accurate piece. well thought out.