So I just took my model 1 5.45x39 gun out for the 1st time and its a jam-o-matic! Im using Bulgarian surplus ammo and C-products mags which form what im reading everywhere are supposed to work great. Well, not mine. It chambers every time when you rack the charging handle, fires and ejects the spent case fine but about half the time the bolt stirps a round off the mag and kicks the tip of the bullet up into the top of the locking lugs. I have 2 of the mags and they both do it. Any ideas???