Ya... But no like he said them " Phillips head screws " are bradded in / mushroomed like a rivit and you could go inside the tube and grind/ file that off flush and back them out . If you just try to unscrew them it will waller out the holes and or damage the receiver tube ..
So it could be done but it's a careful job doing so ..
Most just add a rail on top of that factory rail to prevent that scope slip and no them shallow holes . Like a add on picanilly or weaver ..
Kinda like showed here
Before
View attachment 8091
After.
Just what ever 11mm add on you like I guess