There isn't a lot to say about this, it's short, simple, and clean.

It introduces about a dozen shotgun variants and a similar amount of ammunition various, however the ammo variants can go in any Projectile weapon without the Heavy Trait.

In this PDF:

Shotguns:

• Standard Shotgun
• Combat Shotgun
• Artificer Shotgun
• Auxiliary Shotgun
• Varonia Honorbound Pattern Shotgun
• 'Incisor' Shotgun Pistol
• Varonia Primus Pattern Shotgun
• Astartes Shotgun
• Avachrus XII Pattern 'Gravefiller' Shotgun
• Avachrus II-B Enochian Sanctified Shotgun
• Ork Boomstikk

Ammunitions:

• Nethreun Penetrators
• Avachrun Forgeshot
• VXII Auto-GuideSys Targeting Shells
• Enochian Prayershot
• Gravedigger Shells
• Illuminator Flare Round
• Biologis Impacter N-MF-76
• Xenopurge
• Cryptclearer
• Wyrmsbreath

Some of the guns imply a bit of a more open application to them, and I'd like them to be more described. However, W&G has instances of this and they chaulk it up to "let the GM figure it out". Things like "This can be used as a blugeoning weapon". Those only come up like twice. The Auxiliary Shotgun could use some clearing up, but the ammunition is fine as far as I can tell.