Any idea why this rifle has a heavily checkered buttplate and overall blued finish?
https://www.milsurps.com/images/impo...1/04/sa1-1.jpg
https://www.milsurps.com/images/impo...1/04/sa2-1.jpg
https://www.milsurps.com/images/impo...1/04/sa3-1.jpg
https://www.milsurps.com/images/impo...1/04/sa4-1.jpg
https://www.milsurps.com/images/impo...1/04/sa5-1.jpg
https://www.milsurps.com/images/impo...1/04/sa6-1.jpg
https://www.milsurps.com/images/impo...1/04/sa7-1.jpg
https://www.milsurps.com/images/impo...1/04/sa8-1.jpg
https://www.milsurps.com/images/impo...1/04/sa9-1.jpg
https://www.milsurps.com/images/impo.../04/sa10-1.jpg
https://www.milsurps.com/images/impo.../04/sa11-1.jpg
https://www.milsurps.com/images/impo.../04/sa12-1.jpg
https://www.milsurps.com/images/impo.../04/sa13-1.jpg