I can honestly say that I never experienced any real problems with the gas impingement system of the Stoner design. However, I quickly learned to dread the filth that would become of my BCG after even a short range session. I felt as though I was spending more time scrubbing carbon than flinging lead.
In Review: Adams Arms 5.56mm MOE Carbine Piston Upper
![In Review: Adams Arms 5.56mm MOE Carbine Piston Upper Adams Arms AR-15](https://adigaarmory.com/wp-content/uploads/2014/12/Adams-Arms-AR15_1.jpg)