Surprise! So like I said, reworked model for lower part count, improve things visually and yeah, it drops brass. Your Welcome. 6 Barrel prototype version added this time around too. Turret can now work with the full 180deg range.

[past]
Ok, so first things first. Shout out to @RocCrafter101 for their work on the M134 I used the handle and support for the turret to make this happen.

GAU-19/A Prototype 6 Barrel "Right Front": 158lbs, .50 Cal, 887m/s, 4000rpm.
Not sure why this was abandoned, maybe too wasteful. With this version all guns now eject casings when firing.

GAU-19/A "Middle Front": 138lbs, .50 Cal, 887m/s, 2000rpm.
Increased barrel rotation speed to match fire rate. Added tiny Minigun inside model to make the bullets come from one spot and improve the audio a little. Attached the end of the ammo belt to the primary attachment point via XML. So now all you have to do is attach the main part to your wing/fuselage and then nudge the rotor forward one big step, then move the assembly where ever you like.

GAU-19/B "Left": 106lbs, .50 Cal, 887m/s, 1300rpm.
The lighter weight version for Helicopters and ground vehicles. Has handle added to the back for personnel use. This one is more tricky to attach, you'll have to nudge one of the rotors out, mount the assembly then nudge it back and then everything into place. Sry the handle just makes it difficult.

GAU-19/B Mounted "in the simulated truck bed": VTOL and Trim to control. Just attach the bottom rotor where you want it then nudge the assembly flush. You don't need to mess with the ammo box, I've attached it to the main rotor like the Aircraft version. regarding the spring, it can be hidden where ever. I've put it in the main turret shaft now, if I come out with a new version it will include the update. Just nudge it into place and change the scale to 0.5,1.5,0.5. Sorry missed turret issue again.

AN/M2 Browning "Front Left": Updated to not require the wing part. Save as a sub assembly then open it up in you're simple planes folder. C:\Users\RodWan\AppData\LocalLow\Jundroo\SimplePlanes\SubAssemblies\filename.xml
Highlight and delete from the top of the document to <assembly> then past in instead.
<?xml version="1.0" encoding="utf-8"?>
<DesignerParts>
<DesignerPart name="AN/M2 Browning .50Cal" category="Weapons" icon="Gun-1" description="The M2 Machine Gun or Browning .50 Caliber Machine Gun is a heavy machine gun designed toward the end of World War I by John Browning. Attaches like intakes.">
<Assembly>
This will allow you to use it in the weapons folder. Same can be done with any other sub assemblies.
Or you can just change the name manually. Biggest thing is to change category="Weapons"
Enjoy!