Spitnine,

Your rifle - your choice. The gas rings are pretty cheap. If it makes you more comfortable, and your rifle is functioning fine, then go for it. I would think the gas rings would last more than 800 rounds.

I found out with my rifle, that most malfunctions in the gas system are usually found in the gas key or staking, not the rings. Its certainly wise though to be familiar with your rifle and take preventative measures should you think something is amiss. The parts are pretty cheap. Your confidence in the rifle, though is priceless.