Hello all. I’m Ed, new to this forum and fairly new to the AR world but have shot other weapons all my life and built my first AR-15 (from PSA) a couple months ago. I now have a PSA Gen 3 PA-10 stripped lower receiver and trying to decide how to build it out. I’ve watched the prices on PSA’s website go up steadily over the last few months on all their parts but especially complete upper assemblies. Can anybody recommend another upper manufacturer that will reliably work with my PSA lower? Also is there another manufacture of lower parts that will work with the PA 10 lower? I already have a stock, grip, buffer tube and trigger from another PA-15 build kit but need all the PA-10 specific parts such as pivot pin, take down pin, bolt catch, mag release, and safety. I’m trying to avoid buying the entire PSA PA-10 lower build kit for $179 when I only need about $20-30 of parts. I’m also wondering if the spring I got with the PA-15 kit will work in this PA-10 build and which buffer I need if my spring does work. Lastly, I am still debating on whether to go with .308 or 6.5 Creedmoor... Any and all suggestions are welcome! Thanks in advance.