I swapped my Glock 26's factory sights for Ameriglo GL-429 XL suppressor height sights to lower 1/3 co-witness with my optic (i.e. for back-up). After shooting 200-300 rounds, the rear sight walks to the left. I had a gunsmith push it back. he mentioned dimpling it in place but didn't as he said he felt enough resistance that it wouldn't move--well, it still did. He also asked if I carried appendix as he's seen that move rear sights. I don't know how that could possibly affect it--I never have bumped against anything. Its def recoil that moves it--I wasn't even CCW when it first occurred.
So, what are my options to fix this? The gunsmith said loctite won't help as it's no good on sliding sliding surfaces (true?). Push the sight back, then dimple it somewhere to pin it? Find a taller Glock polymer sight that might grab the dovetail better? Other ideas? Thanks!