A few weeks ago, The Spiffing Brit(1) made a hilarious(2) video (see videos tab) about an exploit in Fallout 4 that allowed pipe guns to become MIRV nuke launchers, which he called The Power of Yorkshire Tea(3) and it was wielded by the legendary Reanu Keeves.  The problem is the process is pretty longwinded and more or less requires you to travel the length and breadth of the map.  In addition to that you have to do some really quick moves with the controller/keyboard so could be a bit frustrating.  It also requires the Far Harbor DLC, which not everyone has.

As a modder I thought of an easier exploit - just clone the pipe gun and override the ammo type.  The end result is the gun consumes the normal ammo of a pipe gun, but launches MIRV nukes, and as The Spiffing Brit mentions, it turns the pipe gun into the most powerful gun in the game.

For those of you who won't watch the video, DO NOT USE VATS.  Although it aims like a gun, you're still firing nuclear warheads, and they don't travel far.  Even with perks, they won't travel through obstacles like bullets can do occasionally, and will go boom on the first thing that gets in their way.  If you're too close, you're about to discover what it's like to be at ground zero.

There are now 3  differences between this and The Spiffing Brit's version.  The first is it doesn't have the weird barrel, and looks like a normal pipe gun.  The second is if you hold down fire it has an automatic mode (just for the lulz).  Another difference (maybe?) is the fact that it can't be modified at a crafting bench.  Any change to the gun resulted in it reverting to normal ammo and you couldn't get it back.  It's also player only, because I didn't want NPCs unleashing Hell, shooting everyone with MIRVS and killing pretty much everyone including themselves and the player.  Mutually assured destruction was guaranteed.  The robots have got it though.  And theirs heals allies too!

To get the gun, it's in the little hut with the elevator platform button for Vault 111, so you can get right from the start.  Alternatively, you can craft it at a chem bench for 1 Fatman, 1 pipe gun, 1 adhesive, 2 screws, 4 springs and 2 steel.

For the robots just get it the same way you would for any other weapon, and it costs the same as the missile launcher.  It only connects to sentry arms, so they're a kind of requirement.  The reason it has a healing effect on allies is because if all Hell breaks loose and the bot lets rip, there's absolute devastation.  My bot took on 20 legendary mythic deathclaws, and laid waste to them in about 5 seconds due to the automatic mode (it launches MIRVs at a fairly fast rate).  There were corpses everywhere (which I then had fun launching through the air with fragmentation MIRVs).  While the settlers didn't seem to take any damage (or or even seem unduly concerned about 20 large reptiles and robot with nuclear weapons being in close proximity), I decided not to take any chances.  It also stopped Piper screaming like a bitch, and the player being murdered by getting caught in the middle of it all.  The healing effect only affects the Automatron and not The Power of Yorkshire Tea the player wields.

Also, the mod for the robots is meant to be for when they're used as guards and not as followers.  They are an absolute nightmare when used as followers.  Anything that pulls aggro results in the robot firing indiscriminately (they're all about equal opportunity death and destruction).  Because of the blinding effect of the nukes, you can't see the enemies, and by the time you've realised where one is you're either dead or the bot has taken care of them.  Your mileage may vary, but don't complain if the game becomes unplayable with them as followers.  Anyone caught bitching will be sent to the naughty step.

Added in version 2 is the Mug of Yorkshire Tea.  This adds 10 to all SPECIAL stats for 1 hour.  To get it head to the chem bench and make it(4) with 1 ceramic, 1 purified water and 1 bloodleaf.  The resale value of it is the same value of the components, so you shouldn't end up out of pocket if you decide to mass produce it(5).  If you're using the DLC version then please uninstall it first because the filename has changed.  If you're in the middle of a play through, you might (I don't know for sure) be able to get away with leaving 1.5 and 2 enabled to avoid it stripping your robots, but it may cause weirdness.

There is also a standalone (you don't need the full mod) add-on that adds Yorkshire Iced Teas to the game.  These are available in Decaf, Fair & Balanced, and Proper Strong flavours.  See the screenshots for the stats, but now you can replace stimpacks with the Power of Yorkshire Tea.  The Proper Strong version also adds double damage for 10 minutes.

Just a note to anyone who's playing on fairly low specs, I wouldn't recommend this mod, especially the Automatron version.  A friend who tested it said it made frame rates drop like crazy and he had CTD several times.  The problem is caused by the automatic mode, and then the rendering of several Fatman MIRVs going off simultaneously with usually more incoming as well.  Once again, your mileage may vary, but you've been warned.

The mod is in the donation point program, but 100% of DP goes to charity.

Anyway enjoy/hate/perform bizzare experiments on it.

Footnotes
1 - The Spiffing Brit was not involved in the creation of this mod in any way, and doesn't endorse it in any way.  He did inspire it though.  He's guilty of that.
2 - The British invented humour and it's not our fault no one else gets it.
3 - Taylor's of Harrogate weren't involved in the creation of this mod in any way, and don't endorse it in any way either.  P.S:  Please don't sue me, for using a picture of your box, and I actually buy the tea.
4 - The installer told you some assembly may be required...
5 - Well let's be honest, Taylors of Harrogate wouldn't be around in the FO universe, or at least their lawyers(6).
6 - It's a joke.  Really, please don't sue me.  I have no doubt of the real world existence of your lawyers.