Sig P320 X5 Red Dot Optic Adapter Plate by Springer Precision Sig P320 X5 Red Dot Optic Adapter Plate by Springer Precision This is a one piece aluminum sight base for mounting a red dot sight to the Sig Sauer P320 X5 pistols. It uses the R1 dovetail slot to mount the sight to your slide and is bolted through the... MSRP: Was: Now: $58.00 Choose Options