Real Avid Smart-Fit AR15 Vise Block w/ Adjustment Handle. Saving you time and energy on repetitive minor adjustments these Gunsmithing Equipment designed by Real Avid are crafted from high-quality materials and designed to work on nearly every AR15 model. Using the included pivot lock insert the block into a magazine well and tighten the adjustment handle to ensure a solid foundation for your firearm-handling activities. An oversized edge allows an exact fit making the Real Avid Smart-Fit AR15 Vise Block a perfect option for lower receiver work. With an incredibly secure hold you can work on an assortment of your rifle's inner workings adding on extra stability for your build. Specifications for Real Avid Smart-Fit AR15 Vise Block: Manufacturer: Real Avid Gun Model: AR-15 Color: Black Condition: New Features of Real Avid Smart-Fit AR15 Vise Block: Features: Great for changing buffer tubes / pistol grips Revolutionary design expands to fit in all AR15 Magwells Includes AR15 Pivot Lock to securely hold upper open for cleaning Knurled Texture for improved Grip in Vise Specs: Fits .223/5.56 AR15s Adjustable Moves to Expand block Expanding Sections Custom Fit Any Magwell Magazine Lock Threaded Post Adjusts Wedge Oversized Edge for Precise Fit Knurled Texture for Improved Grip Adjustment Handle Package Contents: Real Avid Smart-Fit AR15 Vise Block What firearm models does the manufacturer say Real Avid Smart-Fit AR15 Vise Block is compatible with? The manufacturer says that Real Avid Smart-Fit AR15 Vise Block is compatible with AR-15Real Avid AVAR15SFVB: Smart-Fit AR15 Vise Block w/ Adjustment Handle