It appears my proto's have been sold.... Not something I expected. Ok so after doing some math and research for my little DMR project, I think I figured out something that may work here..... So the stock inner barrel is 262mm, The longest -14mm outer barrel extension I found was 11" so we will call it 280mm. That means I can squeeze the 510mm Ra Tech tbb in =) I dont think it will look half bad with this OB extension>
M200 OB Extension and heres the
tbb I contacted WGC and they said the barrel should work with the Open bolt system.