i have a ruger mark ii with a bull barrel. the serial number says its from 1985 if thats important. i recently took the firearm apart for cleaning and maintnance and when i put it back together the pistol would not fire. the bolt with cycle back but when i pull the trigger it will not go off. i recently discovered that if i tilt the barrel pointing straight up when i pull back the bolt, i am able to engage the firing pin and the gun will dryfire. im wondering if anyone else has had this problem and if they are willing to help because i do not want to pay 65 dollars for ruger to fix it.