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SKU: GAG_250017001
JP Rifles Centerless Operating Spring Features Custom Centerless Ground and Polished Operating Spring Large-Frame Carbine Length Precision centerless ground and polished operating springs offer a smoother and quieter operation in AR buffer tubes. Improved impulse feel results in faster sight recovery and improved reliability. 9mm Carbines: This is the buffer spring we recommend for use with 9mm carbines. JP Rifles Centerless Operating Spring Specifications Manufacturer: JP Rifles Model: Centerless Operating Spring MFG Product #: SOSC308 308 Carbine