Played around a bit this morning, got some glazing putty down for visibility, test-fit, etc. Haven't done the side-by-side with the reference pics yet, but I already know I have to do a lot of tweaking. How much remains to be seen (once I'm off work again).
I also did a bit of research, and it seems this barrel jacket would be just the right size for a 5/8x24 thread (western world standard for .30 caliber rifles atm, btw I'm a gunsmith in real life).... Though, I'm running a 16.25mm ID in the mating area of the muzzle device (which is roughly the measurement of the barrel at the cut mark), meaning I'll have to reduce both the muzzle diameter and the mating area to .625" to accommodate the 5/8x24 thread I'd cut.... And I'm currently without a lathe, so that's going to complicate the process just a bit more. Plus, I'd have to time the muzzle device at that point, so that it stops on the threads at just the right spot......
Question: What are you guys using to smooth your 3D prints? This is all PLA (all I have on hand atm, and no settings for anything else), so the acetone steams and stuff that others are doing with ABS etc. won't work here..... I was thinking some 5-minute epoxy would be great, as it's WAY stronger than just PLA with Testor's glazing putty... 
Thanks!
[edit] scored the sling hardware (minus rings) from work... [/edit]
