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My mistake. Then I really don't see any benefit for paying 2X the price, and not getting an american part.

If you don't want to cut and re-thread the barrel what other options could there be? I agree if you are going to do it and make it permanent then do it right and get the steel GK-01 I have the CSS clone. I was also concerned about it being too long, but it's not too bad. Not worth the expense on getting it cut IMO. Have you seen one in person. Maybe just buy a GK-01 or CSS and try it out for a little while first.

Initially my bolt hold open lever was binding on the hammer spring also. I used the same method as Mullet Man suggested and twisted the spring. No need to remove anything. It has been fine ever since. My rod has zero play in the bolt carrier. It does have exposed threads though.

I would be interested! Provided it was a reasonable price.