I just picked up a new Stag Arms left hand stripped upper and I want to build a 45 caliber upper. I am going to use my Olympic AR as a model but I'll have to modify the bolt carrier and build a new bolt and ejector. I am already working on the bolt but I am having difficulty finding someone to make a new ejector spring (at a resonable price). Is there anyone out there that can make a lefthand Oly pistol caliber ejector?????????????????