I'm doing some homebrew stuff for a Dark Heresy/Only War

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>>33014058
A smoothbore mortar is naturally easier to manifacture, but in turn requires more complicated bombs, while a rifled mortar allows for smaller bombs, without fins to stabilize it. The latter is altogether a good idea, if you want the bombs to be multipurpose and easy to carry - something suitable for a "Commando" mortar.

>>33014058
Here's some homebrew from /tg/ for drop trooper regiments, with a knee mortar.
>/k/ doesn't accept pdfs anymore
wtf hiroshimoot.

http://www.mediafire.com/file/7lmuruwxw2huetv/airborne_40k_-_v0.3.pdf

>>33015078
>tfw anon went with my suggestion and statted a knee mortar

>>33014058
I am still being salty that our GM won't allow me to roll an ork. Heck, a Blood Axe yoof. There's even sanctioned imperial boarding party leader - an ork - in the fluff. Salt!

Anyway, according to IA8, there's even pre-loaded 5round drum fed mortars (how?) and grenade launchers that eat regular handgranades. Just a bit of lore that might help you in setting up.

>>33016734
>pre-loaded 5round drum fed mortars (how?)
A revolver at the muzzle of the tube holding the round in place until ignition where it gets dropped down. I dont really see the point since you are definetly faster just loading one after another instead of firing all five and then have a big break to reload the cylinde.

>>33016734
sounds like a tyrant gm.

>>33018226
>>33016734
The 5shot mortars are most commonly used by drop regiments and are designed to be used with a vox trigger mechanism. You can set up the mortar and then radio fire it without needing someone there to load.

Great for ambushes and pre-zeroed fire support when you are undermanned.

I think I read you can use commando mortars in direct fire if you plant them on walls

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>>33016620
>Designed to be braced against a log, tree trunk, or the ground, this odd-shaped base plate helped give the Type 89 its deceptive nickname.

>For whatever reason, Allied soldiers dubbed the weapon the “knee mortar” and some even tried to fire the Type 89 with the base plate braced against the thigh. The 1943 U.S. Army manual on Japanese weapons reported that a Marine on Guadalcanal attempted to fire a knee mortar in such a fashion and the recoil had broken his thigh bone.

neat

>>33018520
Sneaky japs using such underhanded tactics as giving uneducated yank volunteers with shit for brains wrong impressions.