Originally Posted by WoodenPlank
Bear in mind, the 16" with rifle length gas system is what is known as a "dissipator". Dissipators can have gas issues which will make them unreliable. However, several companies offer a "mock dissipator" which is a carbine or midlength gas system hidden under the rifle length handguard, with an A-frame front sight pinned in place in the normal rifle position. You get the handguard and sight radius of an M16 with the better function of a midlength or carbine gas system, all on a more compact 16" barrel.
Wow, I hadn't known that. Reliability is certainly something I want. What type of gas issues are dissipators known for?