I just bought my first AK47 (slr101) and I hear good things about these magazines:

Bulgarian polymer 30-rd magazine with metal reinforced feed lips, Steel lugs



"Waffle Pattern" 30 rd. Original Bulgarian Black Polymer 7.62x39


And then theres is waffle magazine, 30 rd. Original Bulgarian Black Polymer Body with U.S. made Floor Plate and U.S. made Follower.  

Pretty confused.

The Bulgy 'circle 10' waffles are more expensive than the slabs because KVAR installs the USA follower and floor plate. These are used by those who need two USA-made parts for their 922r compliance scheme. The 'circle 10' waffles have the full steel lugs and feed lip liners, while the slabs have the steel liners but polymer lugs. This is based on the slab-sided mag shown being the same one I recently bought - same marking.

Slab sides are commercial, waffles are military.

 The waffle mags are also available w/o the US parts for a cheaper price.  These mags are considered the best non steel mags around. GARY

I have the same rifle that you do, got it a week ago.

I have three magazine types so far:

1) Circle 10 Waffle mags - bought from K-Var.  You do not need the US parts to stay compliant on your 101S so you can save a few bucks.
Fit great

2) Polish Steel mags (the 18 dollar "new" ones)
Fit great

3) US Palm
1 didn't fit out of the box (rear lip had to be filed all the way down to the metal sides (used a diamond stone) for the mag catch to catch instead of lock up). It is now my dedicated 'speed load' traning mag as I don't mind smacking it against the charging handle. The others are being returned. I will likely buy some more of the waffles.

File Job on the US palm the little 'ledges' are where the mag-catch was binding.