Hello: I need the help of present/former Ruger 30 owners, whether for or against. Any frank comments, criticisms are most welcome.
With limited experience shooting/buying rifles, am considering trading my almost mint condition new (Kahr) M-1 carbine (bought in October) for a used Mini 30 with a decent wooden stock, or plastic. I like the ammo prices of the 7.62x39 rounds and would like to diversify to another type of Mini, having bought my first Mini14 (used) and really like it

.
The guy stated that some low-priced 'commie ammo' can be hard on firing pins. How often is this a problem with low-priced Wolf ammo etc? Do Mini 30s have problems with any other components?
I've never taken any gun components apart and don't want a gun which needs work, unless I can buy a part somewhere and a gunsmith can do the work without needing to ship the gun to the factory. Being a novice, I wonder whether I could spot a problem with a used gun, except for rough metal parts etc.
Being an unexpected Mini fan

(bought used 14), the idea of a Mini which shoots harder-hitting very economical 7.62x39 ammo appeals to me. Carbine diversity with low-cost popular ammo might be a good thing in guns.
Having seen no used 30s in stores here and read numerous bad things about the gun on 'THR' and 'TheFiringline', either about the accuracy or larger magazines' problems. Accuracy is not an issue with me, whether for shorter distance plinking or a chance to hunt pigs in the future. These are my only interests when shooting. I only want military-style guns (with wooden stocks, or can be bought) which are very reliable.
Do Mini-30 reliability issues center entirely on magazines or prices?
Are aftermarket higher-capacity mags dependable? Read that MegaMags can hold 20-30 rounds for about $30.
Thanks very much for advice.
PS: What is the name of a website which has used gun values?