Evolution Gun Works Oversized Firing Pin Stop Series 80 9/38/40 For Rear Sight Cut Steel. Also the firing pin stop is thicker to eliminate lateral movement.The inside corners are radiused to prevent cracking so the part lasts longer.The back corner has a .015 radius to break the corner but maintains a square edge to slow the slide opening.Simply stated ?It works? To read reviews from our customers clickhereorhere.Rockwell tested: 48 Rc scale; Available for all models of the 1911. This part is not drop-in. It is oversized and must be fit in order to provide the customer with the benefits stated above.Series 80 firing pin stops will work in Series 70 guns.Series 70 firing pin stops will only work in Series 70 guns.We now offer caliber and series specific firing pin stops. Package Contents: Evolution Gun Works Oversized Firing Pin Stop Series 80 Evolution Gun Works 10372: Oversized Firing Pin Stop Series 80 9/38/40 For Rear Sight Cut Steel