FIRING BOLT STAINLESS STEEL UMAREX HDR50 STAINLESS STEEL The FIRING BOLT STAINLESS STEEL UMAREX HDR50 STAINLESS STEEL is built to last with high-quality stainless steel. This material offers exceptional strength and durability, making it the perfect choice for any serious shooter. With the FIRING BOLT STAINLESS STEEL UMAREX HDR50 STAINLESS STEEL, you can trust in its reliable performance and rugged design.