At least the Gen 4 G17 Anniversary and the G4 G22 that I was able to handle on Friday. They just sat in my hand feeling (almost) like a CZ75 to me. That Good! I don't know what backstraps were on them, only that after finally getting to handle a Gen 4, or in this case.. a couple of them. Both were large framed 9/40s but felt MUCH nicer than the Glock 31 I sold last month. Seemed to sit low in my hand and have a great trigger pull as well! Heck, they both fit better than the current Gen 3 G32 in the household. Now it will be a decision on whether to pick up a Gen 4 G32 or go for the Gen 4 G31.