Is your COLT really......
An AR15???.....if so, it has a chrome lined barrel...and moly won't affect it at all.
This subject is a can of worms..........
A LOT of top BR shooters stopped using it, a LOT still do.
Tactical Shooters stopped using it, and it's an up and down issue.
The only PROVEN benefit so far, has been the ability to shoot more rounds with less copper fouling.........
Period.
But that PLUS, has several downsides.....way too numerous to even start here.
Sinclair is already mentioned, add HART BARRELS to the list.....and that's ALL I got to say bout this subject.