Robert, who made this beautiful custom SIG 510 / Stgw 57 / 510 / PE57 / PE 57 7.5x55 GP11 Sturmgewhehr, explains the design choices that went into it. Both Chappie and Bloke shot it a while back, and it is amazingly smooth.
Gruenig and Elmiger can't be linked to due to YT reasons, but I'm sure you can find their website :)
Fun range day at Brünig https://www.youtube.com/watch?v=wJPXKGL1PHs
Firearms history, blokesplaining firearms mechanics, mythbusting, shooting sports and kitschy sketches all in one place. An often dry and sarcastic look at whatever takes the Bloke's and the Chap's fancy in the world of guns and shooting.