Using an SMG to blow through a door, Not just a door, but well, you'll see Options

[Banaticus]

SMG are not very good for opening locked doors.

Well, let's examine this. Let's look at two doors, a "regular" door with armor/structure 2 and a reinforced security door with armor 8 and structure 9. The rules say... make an attack test, add hits to DV. Barriers get to reduce DV with a pool of (armor * 2), then any remaining hits reduce structure. Each increment in structure makes a one square meter hole. You ignore the normal DV of the weapon and use the special barrier DV. For a firearm, the DV is 2 per bullet.

Spazzo (basically a spaz) -- poor illiterate street thug
Agility 2, SMG 2
HK MP-5 TX (which is cool 'cause it appeared on the trid sim Combat Mage: TNG and so everyone knows it's frakking awesome)*

Spazzare (Italian for "sweep up") -- Spazzo's older brother who joined the Army and trained in close quarters urban assault. Now, he draws a military pension and for extra spending cash he runs in the shadows.
Agility 4, SMG with specialization Ingram Smartgun 4(6)
Ingram Smartgun X**
Spazzare has a smartlink and he's installed the following modifications:
Pistol grip to hang onto it better (1 slot, -1 recoil
Electric Firing, fires from his smartlink, no need to pull the trigger manually -- keeps his finger from getting tired (1 slot, -1 recoil)
Upgraded gas vent 2 to gas vent 3 (2 total slots, -3 recoil)
Kept the foldable stock (1 slot, -1 recoil)
Kept the smartgun system (1 slot, +2 bonus)
Got rid of the sound supressor -- it can't be used with the gas vents and he has a super silenced ceramic pistol in a concealed shoulder holster just in case.

Spazzo's chasing some gonk who just ran into a normal house and locked the door. Spazzo's going to blow the door away with his SMG. He could get -3 recoil, but he's only going to use -2 recoil 'cause only gonks use that shoulder thing and Spazzo ain't no gonk. He'll fire a single narrow full burst at the door.
Attribute + Skill - recoil
2 + 2 - (2 + -2) = 4 and he happens to get 1 success.
The door also rolls 4 dice and gets 1 success, so those successes cancel out -- no bonus DV for Spazzo.
3 bullets, so the attack against a barrier has a DV of 6. Spazzo murtilated the door.

Spazzare is on a run and the technomancer (the choob) just got himself knocked flat by some IC. He got Spazzare in, but there's one more reinforced security door between Spazzare and the McGuffin and Spazzare's only lockpick is his Ingram. Spazzare's going to fire full auto, a long narrow burst, at the door cause time's a wasting and he needs to get in there, grab the McGuffin, grab the choob then get out of there.
Attribute + Skill - recoil + mods
4 + 6 - (5 + -5) +2 = 12 dice and he gets 4 successes.
The door's rolling 16 dice and gets 5 successes, so -1 to the DV.
6 bullets, so the attack against a barrier has a DV of 12-1=11. Spazzare murtilated the reinforced security door.

Spazzare then finds that a reinforced concrete/metal wall has dropped from the ceiling, blocking his escape and trapping him. No problem. He sets the choob down back away from the wall, whips off the pistol grip (it's actually on a powered slide mount) and mounts his Ingram on the collapsible little tripod that he normally straps inside his coat. He sets it up one foot from the wall and backs up, back where he dropped the choob. He then lays down and pulls the choob's body on top of his to provide a little extra protection from any shrapnel. Then he fires a suppressive blast with his smartlinked electronic trigger.
Attribute + Skill - recoil + mods
4 + 6 - (-9 + 10, since the stock isn't braced so it doesn't count and he doesn't have the pistol grip anymore but he is using the tripod for 6 recoil, but he can't have more recoil compensation than his recoil, so only 9) + 2 for 12 dice, with 4 successes.
The wall's rolling 48 dice, so 16 successes, so -12 to the DV.
20 bullets, so the attack against a barrier has a DV of 40-12=28. Spazzare murtilates the wall (blowing a 1 meter square hole -- if he'd hit 30, it would have been a 2 meter square hole), rolls the choob's body off, breaks down the tripod and tucks it in his coat, slots the pistol grip back on, grabs the choob's body again and makes for the choob's car, laying down more suppressive fire at the guards who came running when they heard the horrendously loud noise. Hopefully, Spazzare can figure out how to take the parking brake off.

Note: Spazzare isn't even maxed out. He could have had +2 agility, +2 skill, some nice cyberware -- actually almost anyone could be Spazzare as I've presented him.

*This is the second best SMG in the Shadowrun world. Seriously, why would someone buy an AK-97 when it's "reliability" is only fluff? The HK MP-5 is far more reliable mechanically (the gas vents give -2 recoil, which keeps your dice pool up and helps reduce the probability of a glitch) which means that fluff-wise a truly experienced gun mechanic should know that the AK-97 is not deserving of that reputation. Also, not only does it tie with the best recoil modifiers off the shelf, it's the cheapest and most easily available model. Anyone can buy it.

**This is the best SMG in the Shadowrun world, bar none. And it's one of the cheaper ones too.