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As of now no upgrades have been done. I have a new spring, bushings, and a tightbore ready to install but I want to get the gun running first.
The only thing I've taken apart is the upper. When I put it back together the first time I realized the cylinder head wasn't in the proper place but i caught my mistake and fixed it.
I don't think it's the piston head cause it was still attached to the piston when I checked it.
As far as I can tell everything is put back to where it is supposed to be.
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