I love my 1919. to tell you the truth I got in on the 8mm band waggon when it was new idea . I waited for ammo store to finish the first run of barrels I used a M6 flash hider and the proper feedway spacer. I know many guys had very good luck with it BUT for me it was very expensive as it ruined many parts of my gun time after time. I sold all the 8mm stuff so I would not be tempted again to try and now use 308 or 3006 only with NO trouble at all.
one of the biggest problems I had was when the primer would actualy pop a hole in the back of it and then send gasses throught the pin hole and slam the pin into the sear shattering it or screwing up my sear apring. yes I measured the hole, yes I measured the pin, yes I spent the bucks for new bolt and pins $$$, yes I understand headspace, no NOT turkish stuff. what a pain in the ass it was , 308 I run thousands of rounds with no trouble at all. this dose not mean you will not get good results with 8mm but I never did, I honestly never got more than a few through the gun without breaking something.
on a good word I know you will love it when you get it to fire properly
I used to make linkers and I can help you out with some measurements , even some parts for cheap if you are intrested ever. I think I sold a "kit " to a guy here some time back fer cheap.. measurements and drawings free