The upper receiver is all metal, the rest of the body is plastic, as with the real steel. The metal feels nice and solid. I removed the upper and examined it quickly. Looks very solid from what I could tell. I didn't hear any creaks in the plastic and didn't notice apparent seam lines or anything. But only had it in hand for about 5 minutes, so couldn't really get much detail. I'll post more details when I get a chance to play with it more and examine it closer in better lighting.
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