To the best of my understanding, if you have the know how and the proper tools to put it together yourself, it is just as high quality as the normal WOC. Plus then if you were to buy something like the RA tech hammer set and N.P.A.S., you have the advantage to put them in without having to deal with all the grease and the like. Plus you can deburr all the pars by hand to keep any metal chips out of the system. If you do those, you will have much better life out your rifle.goldentrigun said:They sell the G&P woc DIY systems in the US.
I can't comment on the quality though.