Yes, I use the bulgarian mags. They are waffled on the outside. They have 40 rd varieties too. I have a couple of them, but they certainly are not cheap. $40 for the 30 rd, and $50 for the 40 rd.K-var distributes them. You may be able to order directly from arsenal? I've never tried tho...
What I like is that they fit perfectly in my milled slr. the tapco mags, as I noted in my previ post, simply do not fit at all. The rifle is nothing more than a cumbersome paperweight without mags that actually fit. Until I find an after market brand that will work with my rifle, I stick with the bulgarian ones. I have heard of similar issues from saiga and other arsenal rifles.