ProMag's three-piece set of heavy-duty blocks securely clamp on all flat-top and carry-handle AR-15/M16 upper and lower receiver components to prevent damage or movement to the gun by transferring stress and pressure to the block. Make assembly, repair and cleaning a simple one-person job with these ProMag AR-15/M16 Upper and Lower Receiver Magazine Well Vise Block Set. They are constructed of impact-resistant glass-filled nylon for repeated use without damage. When you need dependable firearm equipment you can count on, you can trust in ProMag.
Fits: AR-15 Platform Receivers
Does Not Fit: .308 AR Receivers