FN L1A1 Firing Pin FN L1A1 Firing Pin, L1A1 Self Loading Rifle, Canadian Army designation C1A1 (C1) or in the USA as the "inch pattern" FAL. 7.62 x 51 NATO Round. Our Firing Pins are precision machined using our CNC Swiss turning centers. The firing pins are made from domestic 17-4 Stainless Steel then heat treated to an H900 condition. We machine the FNC firing pins from SS to help eliminate internal corrosion issues and improve reliability. The heat treated condition helps maximize the life of the firing pin by increases in Strength and Toughness. They maintain a Rockwell C hardness of Rc47. Pin Length 3.305 inches, nose diameter .077 inches Made in the USA!!