DXT2 Big Dot Features XS Sight DXT2 Big Dot Sight for Sig SP2022 - Yellow DXT2 Big Dot Specifications Tritium powered front sight Choice of tritium or non-tritium rear Big Dot front measures 0.188 High-contrast colored front sight Glow dot absorbs ambient light and glows in low light Low-profile V rear provides greater visibility of front sight Simple dot-the-i sight picture Rear sight white outline with tritium center (DXT2 only) Rear sight white stripe non-tritium (DXW2 only) Rear sight ledge for one-handed slide manipulations Durable CNC machined steel