You can buy parts, I think gunsupplies has the GBC lower + 9mm barrel and bolts in stock.. The rest is just standard AR parts..
I tried one using the GBC lower the other day and it worked fine, I only had a quick blat but have seen it running without issue in the past using glock mags.
It is going to run you $1140 for just the stripped lower, barrel and bolt but you can get the whole thing finished for ~2k
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