HIVIZ Two-In-One magnetic front sight. Weve combined green and orange LitePipes into the same sight, to change colors simply turn the sight around on the rib. All Two-In-One sights come with one orange/green round pipe sight and one orange/green triangular pipe sight. Change it fast with Two-In-One! Narrow Model (TO300) fits ribs from 0.218″ to 0.328″ (7/32 to 5/16) (5.5mm to 8.3mm).