I recently bought a Saiga in 223 which worked flawlessly for several months. Even though its an AK style I clean my firearms religiously, after a few months my rifle would fire a round, eject, and chamber a round perfectly, however....... The hammer would get stuck down and while trying to "pull" the trigger nothing would happen. When I removed the receiver cover and fired the weapon I noticed the hammer set down but locked and would not release without a very minor touch. Everything functions just as should in the proper chain of events except for the hammer locking down, any ideas?