AR-15 UPPER RECEIVER VISE BLOCK Working on your lower receiver just got easier. Brownells has been dedicated to providing gunsmiths, armorers and gun owners with the right tools for the job, our AR-15 Upper Receiver Vise Block is no exception. Made from High Density Polyethylene Pin (HDPE) with stainless pins, our vise block will hold an upper securely in a bench vise, like the Brownells Bench Vise, using the included stainless-steel pins. Our Upper Receiver Vise Block is compatible with most AR-15 upper receivers and is a must have for anyone serious about working on AR platforms. Specifications Designed to securely hold the most AR-15 Upper Receivers High De Mfg: Brownells