I order a new regulator nut for retro valve but it was very hard to screw in when reach the point at the oring, I swap the use nut from emag valve and it go in with "little force" as usual, put the new nut into emag valve and it go in with "little foce" as usual, what going on???????
And also what kind of bolt it is? it is from my classic mag.
And also what kind of bolt it is? it is from my classic mag.

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