
Originally Posted by
Asa Yam
Suggest disassembly of bolt, and thoroughly cleaning the inside with an aerosol spray. Reassemble after the spray has died, DO NOT lubricate the inside of the bolt, striker, or mainspring. What is described could indicate the firing pin is either moving slowly, or incompletely, caked-up preservative, grease, oil, or a piece of grit could be causes.
Also suggest looking for drag marks or other defects on the firing pin shaft/assembly while the bolt is apart.
Hope this helps.