This is a friends and he doesn't reload so he wants to trade for a 5.56 set up. He bought the entire rifle during the pres. elect. scare and got reamed good. Anyways he wants to cut his losses and trade for the common caliber. So anyone wanting to build a 6.8 can benefit well from this. He shot less than a 20 rnd box through this and shoved it in the safe.It is a 16" M4 carbine gas system possibly stag barrel with a K proof mark. He is seeking a new 5.56 chrome lined or melonite barrel and new BCG to match. Let me know via the conversation/pm system please.