@GJM has a solution been worked out with CHPWS for your 509T work?
Does anyone have a pic of the factory optics cut in the slide? Is there any sort of recoil bosses for the plate to set in? Or just flat with screw holes in slide.
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The core uses two raised bosses that mate to circular cuts in the optic plate. Not ideal but when done right I like it better than the MOS. In the pic you may notice the sheared screw still threaded into the hole. That’s what happens when you shoot 1,985 rounds in around 20 minutes, dipping the gun in water when it’s too hot to hold. I don’t recommend doing that.
Ok, bringing this one back. Is the CORE system working well for people or has everyone dropped the CORE and moved on? I think I may want a CORE 4" with a thumb safety but I don't want to deal with optics and plates coming loose all the time.