Quote: Is there a reason everyone "had" one instead of "have" one?...I think there can be several reasons, some already stated, why it's a "Had" rather than "Have" situation...
Most of my normal hunting is in pretty dense foliage areas where a 150 yard shot would be the exception rather than the norm..For me a 16" barrel carbine is much more maneuverable than a 20"...The sound factor in a non-point since I almost always have electronic hearing protection on...I have enough hearing loss as it is...
When I was on the 3-Gun and Action Competition circuit, a 20" was just excessive barrel to swing, as most shots were fairly close range (less than 150 yards) with an occasional 200+yd (rare) thrown in to separate the men from the boys...When you are running between barrels and shooting pop up or hidden targets as you advance, a longer barrel is a definite disadvantage...