Sometime this year (probably in the fall, or winter), I would like to build a semi automatic 7.62x54R with a 16"-20" barrel. So for now, I need to design it. I aready have a few Ideas, but need advice/imput. First, I need to choose a reciever to build off of. I was thinking about a FPK or PSL reciever since they are already designed to use 7.62x54R, and use 10 rd mags, but I'm open to suggestions. As long as the reciever can withstand a LOT of shooting (not so much rapid fire, but long shooting sessions), it will work for me. I also prefer them to hold at least 10 rds (fixed mag or removable mag are both fine with me) but it can use less, or more if nessesary. Second is the barrel. I really want it to be either a 16", 18" or 20" barrel. Will a .308 barrel work, or does it have to be .311? (what exactly is the size of 7.62x54R?) As for what this gun will be used for, it will mostly be a range gun, but could possibly be used as a SHTF gun if needed. It does not have to be super accurate, but have decent accuracy (it will be mostly a 100-400 yard gun) Finally, I want this thing to have an old military look to it when it is done. Any suggestions, tips, criticisms, ect. One last thing since I will probably be asked this anyway. I want this because I like the idea of it. I want a semi auto 7.62x54R because I like the round, it is cheap to shoot, and I think I can have a lot of fun with it.