I had a G&P WOC GBBR first - was a total pain the in the ass.
Worked 10% of the time, 90% of the time I was fixing something.
I went with the WE M4 GBBR C02 gen. III and it has been fantastic!
I highly recommend the WE M4 - just buy a replacement #66 steel part and install a RATECH NPAS and your golden.
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