If you want your rifle to continue performing optimally, you need to clean and lubricate it regularly.
A poorly maintained rifle can have excess dirt and fouling on the inside, which can cause the rifle to clog up and reduce the accuracy of your rifle and even cause your rifle to malfunction compromising your safety.
What’s more, is that dirt and fouling can be corrosive, and this can result in rusting and over time cause irreversible damage.
So this is the reason why cleaning and lubricating your rifle is essential. But you cannot use any lube to lubricate your AR15 rifle.