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Focusing on Abwehran infantry at the moment, since I haven't done so in a very long time. To start off, I will submit a brand new Field Rifle, which will be used by planetary defensive and offensive forces.
The MDR-06 Field Rifle is a railgun (or mass-driver as Abwehrans call their infantry railguns) that fires 13x39mm rounds. It comes with two attachments that switch out with the standard handgrip.
The next is a 20mm Flechette Launcher for a close-quarters kick that leaves enemy infantry (unprotected ones) as nasty stains on the wall. For those who do not know what a Flechette is, please see the this image.
All you need now is to put a short description sentence under the header of each item and you'll be ready for approval.
13x39mm threw me off for a bit, as I wasn't sure which ammunition the gun used on the ammunition chart until I looked at the link itself. I'd like to see something like : ammunition chart (13mm) at least once somewhere but it isn't really necessary.
Also, you aren't supposed to post images over 600 pixels without approval so I cropped down the images you posed and changed the background color to SAblue.