Smart parts basic impulse s/n 17830
It allows easy access to the cocking rod.
The thing that I really like about this beavertail over others is the ability to turn it so its facing the downward position when you want it to, this allows you to remove the cocking rod with little effort. Other beavertails that would not move such as the stock would make it rather difficult, you would need to use an allen wrench, or the tips of your fingers, this product just makes it more convenient.
Great accessory for any autococker, I would deffinatly buy another if I ever got another autococker. Well worth the money for what it does.