Have an SKS that may or not be bubba'd... Anywho, I have chosen not to use detachable mags because I like using stripper clips.
What is the purpose of this attachment or the electrical tape method y'all are talking about?
As long as you have good surplus clips with decent waxy/lubricated coatings, they slide A-OK with a push of the fingers. You can tweak the rails to decrease the friction on clips that get sticky in certain spots.
I never have trouble with loading 5 or 10 rounds on a good clip, why block to 5? Is it so that the 5 rounds don't rattle or separate in the clip and you can freely toss the clip once reloaded? I personally bench shoot or stand at an indoor range so I set my clips down gently.