The Different types of gas system is new to me. I hear the DD carbine is dependable enough with the H buffer. I have just learned about this topic. The mid length system I understand is all around better. If I buy a DD im stretching myself on the price as is. I can get a V1 carbine about 125 cheaper than a V5 mid length system. Is the difference in systems worth the money or do I follow my gut and buy the DD carbine system?