... you can take a Norinco and kick ass with the right shooter...
Not specifically responding to 40cal, but commenting on this statement as it has been said a million times on this forum by so many including me while trying to convince people to come to our sport.
No participant on this website is that
right shooter. (Actually, with the exception of Burrell and Imrie; no Canadian is.)
Us mere mortals without the name Sevigny, Jarret, McLaren, Grauffel, Tyc, Leatham, etc. can and will get a boost in results from certain gun improvements.
I'll be the first to admit that I shoot a good, custom gun better than I shoot a cheap, basic gun. My CZ-USA sights & hammer on my CZ-75 made a hell of a difference.
Nobody, in any division, shot 80%+ at the last nationals and didn't have a modified or top of the line gun... you can't buy a win - but you can definitely get some help and they knew it.
Tying this back to the topic, the good sights on the glock will make a difference but others can get that advantage too, so no big deal.