I hope I can find someone familiar with the AR57 platform. I’m having issues with my recently purchased and assembled AR57 rifle. Upper and lower are AR57 brand. Lower parts kit is from Palmetto State. I could not contact AR57; after months of failed attempts it appears they have folded! I asked heavybuffers.com which buffer/spring I should use and a 6.5 oz buffer and Wolff XP spring were recommended. When I test fire the rifle the trigger will not reset after a few rounds. Any suggestions? Thanks!