FGC-6: DMB D.R.U.M. AEG M4 mag adapter for HPA FPA system

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compatibility note:
mag wise I did not had any luck with using Mid cap mags with this.
so it looks like you should stick with Hi cap M4 AEG mags. the spring is stronger on those models.

FGC-6, Rogue-6, partisan-6 wise
keep in mind that you will need the HPA FPA installed!
https://www.printables.com/model/1395346-diy-hpa-fire-pin-assembly-beta-for-the-fgc-6-parti

and have hardware needed to use HPA with airsoft to use this drum mag

front plate wise you can use any of the DMB D.R.U.M. plated you can find. I just added a lock feature to  the ones in this is set but it's not a must

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print settings

print wise just fallow the how to print manual with similar parts. the orientation is good as it is.

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parts needed

Front plate lock parts
3x M3 countersunk bolts 12mm long
1x 10mm, 4mm OD, 0.5mm spring

drum to drum back parts
1x M3 countersunk bolts 12mm long
2x M3 10mm
 

matching plate to tension knob
3x M3 16mm

mag release parts
1x 15mm, 6mm OD, 0.5mm spring or 0.6mm 0.5 is a bit weak
1x M4 40mm bolt (acts as mag release button and spring guide)

slide
1x 10mm, 4mm OD, 0.5mm spring

drum plate (cover for slide and tube and used to lock in the mag catch)
1x M3 10mm ( top left hole)
2x M3 22mm bolt (or close to it)


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assembly 

for more details look at the HPA FPA beta manual

but do make sure to break in the the feed lips of the mag tower.