When I had that one Myrrlyn, it fit Star, CA, Marui AK-47 lowcaps and CA SLR105A1 highcap. All mags fed well and fit well.
Sure, you may not have the "exact" 74-105 series of mags, but I doubt the guy at the receiving end of your barrage is going to care. But he will care that you don't have any pesky hicap failures like jamming or unwinding as your mags feed flawlessly.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.