Luggage

I am anxiously awaiting the arrival of my new Saiga 7.62x39...should be delivered to the FFL later today! I'll be "breaking it in" ASAP and stocking up on ammo and mags as finances are available. I've been reading a lot of good things about the high cap SureFire mags for Saiga. Are these mags "plug and play"? Or are modification(s) required to make these work. Thanks.