Mine came from CMMG. They were blued, not parkerized. Lokedon, a "blued" finish is a black to deep blue finish, but has a lustre to it. Parkerizing is a phosphate finish. It has anywhere from deep gray to medium gray, or even a slate or green tinge to it, on many firearms. It has a fuzzy, flat texture that holds oil very well, like a sponge, which is an important facet to its corrosion resistance.
Some of the SA-80 import mags are parkerized, some blue. Some have had problems with the mag catch hole, and followers with too long legs on them. So, there are several different batches floating around.
As I said, I have some from [url]www.cmmginc.com[/url], which are blued, and came already equipped with USGI green followers. They had the little "England" sticker on the side, and the floorplate is stamped "Imperial Defense".
The springs in the mags seemed entirely adequate, but CMMG tossed in the box some spare springs, their chrome silicon springs. These are even stronger than the springs in the mag. Though the CMMG mags are $25 each, from the inclusion of the stronger springs and green followers, plus the fact that they fit and fall free well, latch up correctly, will hold the full 30 rounds, and are indistinguishable in shape from USGI's (I measured with a dial caliper to compare), I think they are well worth the price.