TDP spec cam pins for AR15/M16 bolt carrier, 4340 steel, heat treated with manganese phosphate finish. What is different about these cam pins, which also explains their lower than average price, is each has been test fired with 5 rounds while installed on our phosphated SBCG, they are thus technically used. We use SCP (SOTAR Cam Pins) on our SBCGs, these perfectly functional cam pins used for test firing became extras. These cam pins are similar to the nitrided SCPs, except they are manganese phosphate coated and do not have the dimple.
Made in the USA.