So my department issues and requires us to use Federal T223E defensive ammo. It is a 55gr .223 cal round loaded with Sierra bullets.
Oddly enough, the only exception to this is that we have a crate of leftover Federal XM193 5.56 that we are allowed to use as well.
I'm in the process of converting my 16" duty rifle to 11". It's a Colt 6940, so the barrel is being cut, a replacement barrel is not an option. Therefore, the gas port size is a major focus for me as my concern right now is reliability with ammo, specifically the lower pressured .223.
What should I keep in mind with these two ammunition choices and my gas port size?
I will also have the ability to use a suppressor, but as it will be in my bag and not on the rifle all the time, reliability without it mounted is very important.


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