Adding The Israel AR-15 75 round Drum Magazine by nils (yay!).

Rifles/AR-15_FOSSCAD_Israel_75rd_Drum_Magazine-nils/README.md

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+# AR-15 75rd 5.56mm Drum Magazine (The Israel)
+
+#### Author
+nils
+
+#### License
+GPL v3.0
+
+#### Version
+0.1
+
+#### Description
+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.
+
+#### Construction
+**WARNING** This is an alpha-quality release. A working drum will require significant manual adjustment. All parts should be printed at 100% infill. 
+
+
+#### Assembly
+
+0. View the exploded view for reference
+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.
+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.
+3. Place the torsion spring cap (red) over said spring. It should fit snugly.
+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.
+5. Place the nubs of the follower (purple) in the holes of the spindle arm.
+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.
+7. Slide the magazine adapter (teal) into the slot at the top of the drum body.
+8. Align the tabs on the rear body shell with the notches on the front body shell and join the two.
+
+#### Operation
+
+0. The procedure for loading the drum is very similar to that of other drums.
+1. Remove the rear cover
+2. Push the key down to remove tension on the spindle
+3. While holding the key down, rotate the spindle clockwise until the follower prevents further movement
+4. Insert ammunition into the available spaces
+5. Replace the rear cover, taking care to properly align the winder with the top of the key
+6. Turn the winder counter-clockwise until sufficient tension has been achieved
+
+
+#### TODO
+* Adapt drum to accept readily-available torque springs
+* Adjust for tolerances/reliability
+* Adapt for better printability
+* Fix follower
+* Adjust drum body tabs

Rifles/AR-15_FOSSCAD_Israel_75rd_Drum_Magazine-nils/STEP/follower.step

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