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48 lines
2.3 KiB
Markdown
48 lines
2.3 KiB
Markdown
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# AR-15 75rd 5.56mm Drum Magazine (The Israel)
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#### Author
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nils
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#### License
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GPL v3.0
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#### Version
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0.1
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#### Description
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A 75 round drum based off of the classic AKM/RPK drum, adapted to hold the 5.56mm cartridge. This CAD contains parts inspired by the Defense Distributed Cuomo Magazine.
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#### Construction
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**WARNING** This is an alpha-quality release. A working drum will require significant manual adjustment. All parts should be printed at 100% infill.
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#### Assembly
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0. View the exploded view for reference
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1. Place the torsion spring inside the inner circle of the large drum body. The spring's outer key should align with a notch in the center ring of the body. The spring should be inserted into the body in the clockwise orientation.
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2. Feed the guide rod (blue) through the hole in the front of the drum body, while aligning the small slot with the center loop of the torsion spring.
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3. Place the torsion spring cap (red) over said spring. It should fit snugly.
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4. Place the key spring around the small cylindrical arm of the key (green), then place the key spring-first into the center hole of the guide rod. The arms of the key slide into the slots of the guide rod.
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5. Place the nubs of the follower (purple) in the holes of the spindle arm.
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6. Align the notch in the center of the spindle (yellow) with the arms of the key, then push the spindle until the guide rod emerges through.
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7. Slide the magazine adapter (teal) into the slot at the top of the drum body.
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8. Align the tabs on the rear body shell with the notches on the front body shell and join the two.
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#### Operation
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0. The procedure for loading the drum is very similar to that of other drums.
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1. Remove the rear cover
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2. Push the key down to remove tension on the spindle
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3. While holding the key down, rotate the spindle clockwise until the follower prevents further movement
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4. Insert ammunition into the available spaces
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5. Replace the rear cover, taking care to properly align the winder with the top of the key
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6. Turn the winder counter-clockwise until sufficient tension has been achieved
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#### TODO
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* Adapt drum to accept readily-available torque springs
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* Adjust for tolerances/reliability
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* Adapt for better printability
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* Fix follower
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* Adjust drum body tabs
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