hi guys, i'm in the process of building my 2nd m14 rifle. i'm buying the norcm14 basically just getting the receiver all other parts gi parts. actually i'm retaining the following parts: 1) op rod, 2)gas cylinder assy. is the gas cylinder assy will fit(the thread) my commercial nat. match barrel? speaking of quality and performance, can the norc op rod can compete with the gi op rod? would appreciate any information you can provide me. tx........