Aero customer support says 75+ grain ammo - Aero Precision M4E1 Threaded 18in .223 Wylde w/ ATLAS S-ONE Handguard Complete Upper Receiver with Flash Hider

I have this upper but haven’t fired it yet. I wrote a message to Aero Precision customer support because I had seen several reviews mentioning the rifle not cycling properly and I wanted to know if it’s a common issue. Their response (ticket number OMR-79910) was that the cycling issues are from people running ammo with too light of a bullet weight. They said they recommend at least 75 grain bullets for the rifle to cycle properly! I didn’t buy a 1:8 twist upper to only be able to run match ammo. I wish I had bought something different if it will inexplicably only work with high dollar ammunition.