Is it normal for these magazines to be glitchy? My new Tisas 1911 came with 2 magazines. One of those mags would not lock into the gun, and close inspection revealed an obvious flaw. My dealer exchanged the defective mag for a good one, and then I bought 2 more new mags, one of which works, but requires a bit of manipulation to get it to slide into the well. Is this normal for 1911 mags, or am I just lucky?