USED Wilson Combat Sear Spring Bullet Proof 417. A Bullet Proof Sear Spring has the perfect balance of materials and temper to allow the pistolsmith the flexibility necessary to do a top quality trigger job which will continue to maintain its tension long after factory springs would have died. For a Bullet Proof trigger job get a Bullet Proof Sear Spring.; Specifications for Wilson Combat Sear Spring Bullet Proof 417: Mfg Item Num: 417 Supplier SKU: 02529 The Wilson Combat Sear Spring Bullet Proof 417 is a quality addition to the Wilson Combat lineup. For more great deals on Pistol Parts by Wilson Combat please browse our Wilson Combat Gun Parts page. WILS 417 BULLET PROOF SEAR SPRING