EGW Oversized Firing Pin Stop Series 70 9/38/40/10Material: Carbon Steel Stainless Steel Caliber: 9 38 40 10mm Series: 70 Hardness: 48 Rc Drop In: No EGW firing pin stops are wider than normal to prevent extractor from turning, which leads to more reliable ejection. 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