290 is great for tightly fit and already assembled parts but it really has no "fill" ability. 262 is used for sloppy sight fits and also is recommended for plunger tube installs as well. I've used it for both with great success. In the dawson precision sight install video you can see just how thick it is, compared to 290 that's about the consistency of rubbing alcohol.
I surely wouldn't ditch the gun for an o/s sight cut, frustrating but there are fixes out there.
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