Wish I had found this thread before sending my Springfield Hellcat slide in to be cut for the Holosun 507k. What I got back was not a very tight fit for the 507k, so only time will tell if the gaps allow for movement or strain on the optic. Photos added below.
I received my slide back approx 3 weeks ago, after about 5 or 6 weeks at their facility. That's not an issue, since they said it would likely take a while. But I was hoping for tighter tolerances...I can fit a thick business card in between the holosun footprint in both the front and back.
The bigger issue though is that they broke my Hellcat front sight while milling the slide (which was one of my wife's favorite features of the gun), and replaced it with what I am 99% sure is a suppressor height front (and left the stock rear sight). So now I have a standard height rear sight, and suppressor height front. To make matters worse, I have emailed any email address I can find associated with them and am consistently waiting weeks to get any response. Will from CHPWS reached out to me on March 31, after getting my contact email from someone else after I emailed them several times. I responded 12 hours later and have yet to receive a response. I followed up with Will on Apr 5th to see if he needed any more info or photos, and then again on Apr 7th, and most recently yesterday on April 13th, and am still waiting for a reply. At this point, if they just want to mail me a matching rear sight, or a standard height front that matches the stock Hellcat sight, or just send me the money to buy one on my own...I'm pretty flexible in how this gets addressed.
I understand that mistakes happen, but I'm getting tired of trying to reach out to them so they can address an issue that they caused.