Originally Posted by
deanq
I built a 16" and a 20".
For "me", the difference is the gas system. 16" is mid length and is ammo finicky and required an adjustable gas block to be 100% reliable with the "one" load I run in it.
20" is rifle length gas, standard gas block, and is NOT ammo finicky and will run 100% with a larger ammo selection (not all 308 ammo is equal).
Pick your poison. Each configuration has it's plus/minuses. Pick what's best for you/your mission. Best tool for the job and all that.....JMHO YMMV
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