Hello all, new to the forum. I have been an avid gun collector since I was a kid. I have many in my collection. A friend of mine recently showed me one of these and I am now looking for one to call my own. I have always takin apart and cleaned my own guns. However, I have never built one. I have the general knowledge of the parts but have no idea what works with what. I would like to build one of these and am open to your help. I have only a few things on my part. It can be either a bolt gun or AR based but I would like to know the cost difference before we start. It will have to have at least a 16" barrel (local laws). I am building it for the subsonic loads although some supersonic rounds would be nice. I would assume that a 1:8 twist would be right from what I have read on here. A suppressor would not be out of the question but I am still looking into it. From what I have found I would need the federal stamp and also at least a C&R permit (also quick question: If you pay for the stamp is it per weapon, or does it cover all your weapons? or do you have to pay per violation on the weapon?TIA) SO what are my options for a good quality on a budget. Also what kind of funds are we looking at here. Just out of curiosity what does it cost to build a .500 whisper. Sorry for the long post and thanks.