The Evolution is XLR’s original and most widely used chassis system. The Evolution offers a lightweight and durable stock solution for most popular barreled actions. A new feature for the Evolution chassis is the addition of a M-LOK™ compatible 14†octagonal aluminum handguard. This new design allows a more updated look and increased versatility for aftermarket accessories. Remington 700/Defiance Deviant Long Action CIP LENGTH MAG WELL