I bought my sigma from RedWolf from the first set they got so i have played many games with it, somtimes as pri gun and somtimes as backup.
So i found couple of differences to my gun from the article
1. the co2 capsule is plentyful. at winter when the temperature is -8 to -10 celcius degrees the capsule holds power to empty 5 magazines at higher temperatures it empties couple mags more (so how cold was it when nuno tested his gun?).
2. The mag holds 40 BB:s when loaded full!
3. Compared to the real"steel" gun, the finish is good.
Shade
F.N.O