Magazine adapter for sks - ProMag LVX SKS 20 Round 7.62x39mm Rifle Magazine w/ Lever Release

Stock SKS uses stripper clips to feed the stock fixed magazine irs 10 round capacity.
Removing the stock magazine can enable attaching this proprietary higher capacity magazine and let
the SKS function like a modern semi auto rifle.
BUT…there are Russian SKS rifles, Yugoslav, Serbian and Chinese SKS and all are slightly different.
I have a Chinese one and after a good deal of degreasing, cleaning and lubricating, this mag fit my gun with
no modification to the magazine or the gun.. All original parts can be replaced if desired.
As a test I cycled several snap caps thru the new mag with no problem.
Detaching and re-attaching these mags requires some practice.
No live fire tests have been done yet Scheduled for this week.
If live fire tests are successful I will order a couple of more of these.
My main criticism is that no instructions for approaching the new magazine were included but there
are several on YouTube.