Nice block for working on your ar - Midwest Industries AR-15 Lower Receiver Block

This Lower Receiver Block is seemingly made of very durable plastic and is a great tool to have for working on your lower. I bought it primarily to hold the lower so I can replace the Receiver Extension (Buffer Tube) from Commercial to Mil-Spec. This block did the job. I did put a bit of wood between the block and my vice jaws for two reasons 1) to protect the block, and 2) because the way it sat in my vice the jaws were not in a place where it would bite down evenly (meaning one of the jaws fell inside a contour of the block). Adding the pieces of thin plywood spread out the pressure and it worked perfectly. Not a fault of the tool, but a fault of my vice.