AGW 1911/2011 Mainspring Cap Retainer Pin Atlas Gunworks 1911/2011 Mainspring Cap Retainer Pin Features: 1x Atlas Gunworks Mainspring Cap Retainer Pin Made from 17-4 Stainless Steel with Black Nitrate finish Manufactured at Atlas Gunworks Flat Base For Flush Fit MSRP: Was: Now: $2.50 Add to Cart