[deadeye1]

I recently purchased a full auto KRINK. It is registered as 5.45 x 39 and has this stamped under the ejection port. However, on the other side of the Poly Tech receiver is stamped 5.56x45. SWD Inc is listed as the manufacturer/importer on the Form III registration. The gun is obviously chambered for 5.45 as it shoots flawlessly. I am assuming that SWD simply used a Poly Tech 5.56 receiver for the build. Apparently using this receiver for the build made no difference in the final product.

Has anybody else seen this type of build?

 

[rayman1]

You seemed to have pegged it. Photos would be great.

 

[BigAL]

This one started as a .223 FA chinese just as yours did