Forward Controls Design AR-15/M16 Pivot and Takedown Pins Black. 040) is a set of elegantly simple and superbly crafted AR15/M16 pivot and take down pins. Machined from 17-4 PH SS bar stock and QPQ finished these pins are 0.040 longer than TDP spec pivot and take down pins. PF-040 pins can be aptly described as "reverse extended" in that they're longer on the left side of the receiver the additional length of the take down pin doesn't interfere with ambidextrous safety operation. When PF-040 pins are pushed in from the left side the +0.040 transforms to extra length and grasping area on the right side pin head which combined with their silky smoothness makes pulling the pin a cinch. PF-040 has the same elegant and unadorned pin heads design that is in line with our design philosophy which prioritizes functionality over aesthetics. PF-040 right side pin heads (when installed on a receiver with the muzzle pointing away) are flat with a small 45 degree chamfer. Serrations or dimples on the right pin head would be useless so they're completely plain. There is a small dimple on the other side of the pin head the tip of bullets (up to 9mm) can be used to push the pins in on tight fitting receivers. Specifications for Forward Controls Design AR-15/M16 Pivot and Takedown Pins: Manufacturer: Forward Controls Design Finish: QPQ Color: Black Fabric/Material: 17-4PH Stainless Steel Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: M16 AR-15 Features of Forward Controls Design AR-15/M16 Pivot and Takedown Pins 0.040in longer than TDP Tool-less easy install feature Package Contents: Forward Controls Design AR-15/M16 Pivot and Takedown Pins What firearm models does the manufacturer say Forward Controls Design AR-15/M16 Pivot and Takedown Pins is compatible with? The manufacturer says that Forward Controls Design AR-15/M16 Pivot and Takedown Pins is compatible with AR-15 M16Forward Controls Design PF-040: AR-15/M16 Pivot and Takedown Pins Black