NcSTAR AR-15 A1/A2 Front Sight Combo Tool. This Gun-Smithing Tool made by NcSTAR comes equipped with 4-prongs on one end for A2 and M4 style front sights and 5-prongs on the other that includes A1 style front sights. The NcStar AR-15 Combo Front Sight Tool makes adjustment of the elevation much simpler so you will not have to waste any time making changes. This NcStar AR-15 Combo Gunsmith Tool is made with extremely high quality steel construction for an incredibly strong and durable tool that will last an extremely long time. The NcStar Scope Mounting Tool for AR-15/M-16 is so lightweight and compact that its addition will hardly register. Specifications for NcStar Combo Front Sight AR-15 Scope Mounting Tool: Material: Steel Length: 2.28in Weight: 0.8oz Gun Model: AR15 Features of NcSTAR Front Sight AR-15 Combo Sight Mount Tool: Designed for AR15/M16 A2 A1 and M4 front sights 4-Prongs on One End 5-Prong on the other Simplifies elevation adjustment Package Contents: NcSTAR Front Sight Combo Tool for AR-15 A1/A2 TARFSCT What firearm models does the manufacturer say NcSTAR AR-15 A1/A2 Front Sight Combo Tool is compatible with? The manufacturer suggests that NcSTAR AR-15 A1/A2 Front Sight Combo Tool is compatible with AR-15NcSTAR AR-15 A1/A2 Front Sight Combo Tool TARFSCT