Hey guys, I'm new here just got a 500A and have a few questions. The 500A combo i got was used but never shot, in great shape just a safe gun. I was going thru it and noticed no threaded take down screws on the barrel for a stud. Is this normal for the older guns? There is a hole but i cant tell it is threaded but its on the bottom of the welded barrel mount. Do i need to just get a new barrel screw? Also for a 2 point sling for hunting is there any options instead of drilling and tapping the wood stock?