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KJW's HAVE UPGRADE PARTS AVAILABLE
And they're made by laylax
Pretty sure Amos has them
Between WE open bolt and KJW, I'd say both are pretty reliable, it's a good contest between the two.
I can say for sure the open bolt system is the simplest system I've seen yet, but that's speaking for my PDW only. I haven't seen what their M4 open bolt system looks like.
However in the PDW is consists of only TWO moving parts, a bolt carrier and a GBB pistol air nozzle.
Your pretty good either way, but KJ only has the ugly ass thermold mags. WE has CO2, PDW and regular M4 propane mags.
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