I use P-Mags.. Never have had any issues with them and it seems like most people use them as well since they are "cheap"... A lot of people use upgraded GI mags as well, but it's really whatever floats your/their boat.. I'd say to buy a bunch of 30s, a few 20s, and a few 10s.. They all have their advantages and I assure you, you'll use each one and find the advantages quickly.

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Isaiah 43:1-3