The big gain on the 18.5 plus an extension is the reduced length, and weight.
Except after the cost of the gun, plus the extension and add on all the taxes and shipping, you are actually exceeding the price of the 20" version because its ends up being around $680ish dollars after all said and done. ($500/gun, $100/extension, $80/taxes&ship)
Not a big deal, just know that you pay the same or more for the 18.5 as the 20 if you get the extention. You end up with less length, weight, round capacity and no bayo lug as a result.
I'll keep it stock for a while then consider it in the future. I think the extension makes the 18.5 look better and adds extra capacity. I already have a 20" Mossberg anyway.




















































