The biggest problem with the C1A1 aside from its reduced reliability in arid conditions, was the placement of the Rear Sight and Foresight on different components of the rifle. Placing the Rear Sight on the Lower Receiver and the Foresight on the Upper Receiver further limited the rifle's inherent accuracy as play between the Receivers resulted in slop within the sights. The C1's weight and length were also significant shortcomings by modern standards, but typical of the post-WW2 Battle Rifle genre (including the HK G3, M14, and others).