Dirty Bird's Easy Push Pivot Pin provides that extra little bit of surface area to quickly get started disengaging the pin. It extends about .03" further than standard mil-spec pins which isn't enough to get snagged but is plenty to help you quickly and separate the upper and lower receiver. Compatible with AR15 / M16 and M4 variants with .250" diameter takedown / pivot pin lugs. Divots in the pivot pin provide a more positive grip Mil-Spec Mag Phosphate Finish Precision machined from bar stock steel Case hardenedAmerican MadeDirty Bird Industries' Limited Lifetime Warranty