Buddy bought a New Saiga today and we had about 12 mins to try it out so we went and fired 10 rounds I collected the brass and when we got home I noticed that one of the cases had split from the top about half an inch down. We were shooting 125gr soft point Golden bear ammo, after we noticed the case we inspected the rifle and noticed nothing damaged or out of the ordinary. We did a quick cleaning of the rifle before we went out . While firing the rifle we didn't notice anything and all the casings fell withing a foot of one another. My question is how concerned with this should we be?