Some questions for everyone

[C4iGrant]

Been interested in building some AR's in this cartridge and had some questions if you don't mind.

1. What barrel length allows all of the powder to burn?

2. What is considered the optimal barrel length in an AR platform?

3. If one is using 200gr-220gr bullets, what is the best twist rate to use?

4. What size Suppressor seems to work the best? 9mm? 308?


Thanks for the help guys.


C4