Your M has 15 imported parts in its OE configuration. Stock and handguard are minus two, leaving 13 imported parts -- three parts too many. Your parts swap alternatives are: Gas piston (-1), followers (-1), and floor plate (-1). Or: Murray FCG (-3). Be aware that 100% US-made AK mags have a poor reputation for reliability -- which is why Plug and I suggested swapping mag parts and not the whole mag. Also be aware that using magazine parts for compliance purposes can be an issue should you acidentally grab an unconverted mag.
Another option would be to just leave it alone. 922(r) only prohibits "assembly", not possession or transfer. But be prepared to prove beyond a reasonable doubt that you purchased the rifle in it's current configuration . . . some folks are understandably nervous about this option . . .
As always YMMV,
Larry