Hey everyone,

I’m looking into adapting the Plastikinov v4 from 5.45x39 to 5.56 NATO. Good news: apparently the mag lockup is identical between calibers, so only the follower needs modification.

According to people familiar with the design, it “shouldn’t be too hard looking at cartridge specs” to adapt the files.

What I need to research:

• Follower geometry differences between 5.45x39 and 5.56 NATO magazines
• Taper differences: 5.56 is straighter than 5.45x39
• Barrel/bolt specs: What changes beyond the obvious bore diameter?
• Trunnion and bolt carrier might be identical between calibers
• Commercial 5.56 AK mags to test-fit geometry (Galil, M85, SLR-106)

Has anyone here done work converting AK receiver files between these calibers? Any gotchas I should know about beyond the follower and barrel?

Alternative: Should I just buy a ZPAP M85 and call it a day?

Thanks!