Just had my frame replaced due to a broken front guide rail.
Only 2 reported in the last ten years.
My new one is all original but with a new frame and s/n and looks like yours.
My rails are just backward from the OPs in that the other side appears looser, but the function is flawless.
Put about 70+ rounds through it this past weekend and not single failure.
Did a detailed strip and no noticable wear on frame, slide or guide rails.
And I did check the rails under my magnifier eyes.
P.S. Customer service/turnaround and other things were A+.
Diocoles
DAV
Life Member NRA
VFW Member