I just updated the WMK AA-12 Combat Shotgun replacer to v1.0.1. Available on the http://www.fallout3nexus.com/downloads/file.php?id=3388 page. This is the first time it's been updated since its original release in Feb 2009 - around a month after WMK itself was first released.
Here's the changelog:
Version 1.0.1 (14-09-10)
- Shotgun traps now incorporate the AA-12 model rather than the vanilla Fallout 3 combat shotgun model. (No changes required to compatibility patches; these are new meshes only.)
The shotgun trap meshes were kindly modified to hold the AA-12 by showler. Here's a picture:
http://www.fallout3nexus.com/downloads/images/3388-1-1284445480.jpg