I love magazine supplements.
They add a deeper dimension to existing model kits, granting them new weaponry and/or armor parts to further deepen their lore. The December 2016 issue of manga compilation Gunpla Ace comes with a runner of parts for you to build two weapons ostensibly for the HGIBO 1/144 Gundam Astaroth: the massive 210mm Anti-Materiel Rifle as well as the heavy Pile Bunker Shield.
The Rifle is HUGE, taller than the Astaroth and also the Barbatos Lupus. It also comes with a small joint part for attaching to your Gunpla, although attaching to the Astaroth requires the removal of its right skirt armor. You will need additional joint parts to mount it on the backpack, as I've done with help from the joint from the HGIBO 1/144 MS Option Set 5.
Although the Rifle is massive, it is still fairly light enough for any mobile suit to grip and pose with, although the bulk may make holding the rifle with both hands a tad difficult. Patience is key. The Pile Bunker Shield is interesting in the sense that it looks heavy enough to both deal and take a significant amount of punishment, but is actually pretty light to be able to be mounted on the forearm.
This supplement is a great addition to the arsenal of IBO, more guns are welcome to the plethora of melee-oriented weapons!