This is a cool product I got to try out a while back. http://vikingtactics.com/specialtyslings_backpack.html This is actually a really good product if you run with just a chest rig or MAV, but I assume you will be using some sort of pack for your two day games. A good idea could be having a 2 point sling on it, and using 2 weapon catches on 2 separate 45 degree mounting panel such as this... http://www.tacticaltailor.com/CatalogueRetrieve.aspx?ProductID=3249255&A=SearchResult&SearchID=1258014&ObjectID=3249255&ObjectType=27 You can mount them diagonally opposite of each other so the rifle is held at an angle. Then use a few D-rings to attach the sling to the pack for a sure fire attachment.