We will assume that the shooter has 5 agility, 5 skill with an implanted smart link for a total of 12 dice on either the shotgun or automatics roll. We will also work under the assumption that the shooter has 5 points of recoil.
We will assume the defender has 5 reaction and 4 intuition for 9 on the dodge pool. Also the defender is wearing a lined coat for 9 armor and a body of 4.
Lets look at the AR first (Ares Alpha). We will be using average rolls rounded to the nearest integer. so all attacks will generate 4 hits.
Damage is 11 -2 ap so would be staged up to 15
In Semi auto the defender would score 3 hits. Damage is staged down to 12
In Burst fire the defender would roll 7 dice and score 2 hits. Damage is staged down to 13
In Full Auto "Long burst" the defender would roll 4 dice and score 1 hit. Damage is staged down to13
In Full Auto the defender would roll 0 Dice, However the attacker's dice pool is reduced to 8 for an average of 3 hits. Damage is staged up to 14
The Ares Alpha has armor pen of -2 so rolling 7 armor and 4 body the defender would achieve an average of 4 hits. Staging the listed damages down by 4
Now lets look at the shotgun (Enfield). Base damage of 13 (with slugs) -1 ap that would be staged up to 17
In Semi auto the defender would score 3 hits. Damage is staged down to 14
In Burst fire the defender would roll 7 dice and score 2 hits. Damage is staged down to 15
There are currently no shotguns in SR5 with Full Auto.
The Enfield has armor pen of -1 so rolling 8 armor and 4 body the defender would achieve an average of 4 hits. Staging the listed damages down by 4
Finally we will look at the shotgun with buckshot. Damage is 15 (buckshot narrow spread -1 dodge) with ap +5 and is staged up to 19.
In Semi auto the defender would roll 8 dice score 3 hits. Damage is staged down to 16
In Burst fire the defender would roll 6 dice and score 2 hits. Damage is staged down to 17
For medium spread at short ranges Damage is 14 (buckshot medium spread -3 dodge) and is staged up to 18.
In Semi auto the defender would roll 6 dice score 2 hits. Damage is staged down to 16
In Burst fire the defender would roll 4 dice and score 1 hits. Damage is staged down to 17
note at close range medium spread the average damage is the same as narrow spread. However you can target 2 defenders
The Enfield w/ buckshot has armor pen of +4 (rules check? With my rounding 17vs18 dice won't matter but it would be nice to know) so rolling 13 armor and 4 body the defender would achieve an average of 6 hits. Staging the listed damages down by 6.
In Conclusion after all dodge/armor modifiers:
Ares Alpha does 8 DV in Semi Auto 9 in a burst and 10 for full auto
Enfield does 10 DV Semi Auto, and 11 in burstfire with slugs
Enfield does 10 DV Semi auto, and 11 in burst fire with Shot in close range narrow or medium spread.
Edit: after the staged up in armor the buck shot would be dealing non-lethal damage to this target.
Looking at the numbers wide spread does nothing to help you.
These are based on average rolls and your personal results may vary. I do not account for any "Special ammo" for the ARs or Shot guns. APDS or explosive ammo would increase the ending DV as well as increasing the ranges beyond short but you can do the math yourself. I hope this has been an informative post.