Get a bolt disassembly tool. Remove bolt, remove firing pin shroud with tool. Firing pin and spring assy will pull out as one unit. Clean with gun scrubber, etc. Use a swab or brush to clean the inside of the bolt, gun scrubber here too. Clean bolt face and firing pin hole. Reinstall firing pin assy into bolt. Use too to reinstall shroud. Reinstall bolt assy into gun... should be all better...