Harley can do a semi auto mod to the M14 for you. Its a full auto only gun when you get it. Make sure he fuses it for you too. If you dont want to wait on ASC, Den Trinity has them for sale with no wait, I think KamikazeSM can also get them. Im not sure how long that would take though. You might want to ask Harley about what is needed to upgrade the internals. If its a semi auto sniper gun I think you can take it up to 500, but dont exceed that. Keep in mind that if you go over 400 you cant shoot anyone within 50 feet, which can be a problem. Get a good backup if you go with the mod over 400 fps. ASC will upgrade it for you before they ship it. If Harley cant upgrade it for you by simply getting some parts, youll have to order it from ASC pre upgraded, which will take a long time.