Prop/Fidget M3 Grease Gun

--This model fires no projectiles and is meant only as a prop and a fidget toy--

I've always really liked the look of the original American Grease Gun, and thought it would be a fun little thing to fidget with.
So I made it.

SHORT VIDEO DEMONSTRATING FUNCTIONALITY HERE:
https://imgur.com/a/hBBBwwz

Functionality includes:
-Open/Closeable Dust Cover that acts as a safety, just like the real thing
-Removable Magazine with working Mag Release button
-Extending/retracting stock
-Unscrewing Barrel with Barrel Retaining Lever
-Full working charging and "firing" system with working charging lever, trigger, and spring-tensioned bolt for realistic movement.

All parts are fully 3d printed, so there are zero required extra hardware bits. However, you may swap two of the 3d-printed springs with pen springs if you so desire.

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PRINTING:
I printed almost everything at .16mm layer height, and 3 walls. The only exceptions were some of the load-bearing smaller parts that got 4-5 walls and higher infill.
Everything works fine in PLA, but I suggest you print M3GG-BoltStop in TPU, as it makes the action much quieter and prolongs the life of the moving parts.
You WILL need supports, and brims are recommended for small pieces, as well as the main body. Normal supports work best in my case.
All parts are preoriented for optimal printing.

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ASSEMBLY:
I have included an opened image of the back half that shows the assembly of the rear internal components. You may replace the spring behind the trigger with a pen spring slotted into the horizontal cutout behind the trigger if you want.

Unfortunately, the counterpart image showing the front half internals was corrupted. Most everything up there is self-explanatory and can only fit in one way.
M3GG-BoltPusher slides over the notch and fits onto the squared portion of M3GG-BoltLeverPin, oriented so that it points away from the notch. That assembly then fits into the cutout in M3GG-Body-FrontA.

The only other thing that needs explaining is that M3GG-StockSprings fit through the rear rectangular holes of the stock tubes and down into the cutouts underneath.
They should be oriented such that the bits extending into the tubes should be vertical at the tip.

I think that's everything!