Why.
I saw a G27 today on consignment at one of my local funshops.
There was grip tape covering the top of the slide aft of the ejection port. Also, it covered the right side of the slide, aft of the ejection port.
I would have taken a picture, however I was deeply offended by this abomination, an affront against Gaston Glock and basically all that is good and well in the world. I had to buy it and immediately set about restoring it back to her proper condition. Luckily, the adhesive was no match for the slide and disappeared quicker than gun rights and economic freedom in a Democrat presidency.
Anyway, I had to ask from the employee at the gunshop. Why?
Apparently, an older couple bought the gun and had trouble manipulating the slide. I guess the grip tape was supposed to help. How would have they have been effective with a subcompact .40 S&W when manipulating the slide was challenging?
I decided to confirm my suspicions. I did a partial detail strip on the G27. From this, it looks like it has very, very few rounds through it. Ever.
Too bad that some places focus on selling what they think their customer should have, rather than selling them what will work for them.