I have the opportunity to buy a 340pd in great used condition for 600. It has the high-viz fiber optic sight (not night sight). This is local. My reservation with this gun in that it does not have night sight. Or I can go with the M&P 340 with night sights from cheaperthandirt.com for about 700 brand new. Any thoughts? I would like to have one by this weekend. Thanks. I was going to add a pole but I do not know how.