Hey guys this is my first post but I have been lurking long before I signed up. Let me first say this is a awesome site, I learned a lot off this site. My first AR was a M&P Moe, I sold it last year to buy some revolvers well last night I went to my local range and they had a Sig P516 with a 7.5in barrel that they just got in and I took it home. I took it shooting today and I love the gun a lot! I have always wanted a SBR and have been reading up on them since before I bought my first AR, My question is, can I legally turn this AR pistol into a SBR? Everything im pulling up is building a SBR from scratch. What forms do I need to fill out and send in? Any and all help is appreciated