Increase your accuracy with this simple product. The stock extender is a combination kit that helps you to adjust the stock length correctly and at the same time protects your stock. The stock extender is a durable neoprene sleeve with 3 different sizes of foam inserts. Combine one or more inserts to find your right length. Available in black and in Prym1® Camo. If you use a rear end add on night device, you need this!