My .2 cents follow:
1) Agree with LavaRed, avoid FRP and make your Blast smaller than 1''
2) Theese are not K's but M's. Reconsider your design and go one of them, not a mix both. Already tried and doesn't work.
3) Bullet path is .245. Right ?. Go more for your first can unless someone else is building for you. .285
4) Go 7 inches total tube and spread Baffles at equal distances. 5/6 Baffles + Blast is all you need.
5) Fasten Front & Rear Caps fron inside insted of from outside. Thread caps outside.
6) Don't talk about spacer due to the fact that is not clear if those are K's or M's: In case of M's, do comunicate all the chambers.
If you are trying to make a dual Can (22 and 223) i do recommend you to start thinking on splitting Blast Chamber and Baffles Chamber so you can have one Blast per Caliber and share Baffles one. I tried and do OK. Tricky.
going to post up a pic of the tweaked design soon
thanks for your advice, ill definitely check out k's and m's and research each individually
the tube is already threaded internally and the caps are threaded externally. it is clearly visible in the first image
As far as your advice for not making it myself if I want tight tolerances - the products I currently manufacture are +0 -.001 on average; I am fully aware of geometric tolerancing. I assure you someone else is going to make it sloppier than if I made it myself.
Now if you are concerned with the ID being too small in due to regards of functionality and safety, then I welcome your advice on the best ID for my design.