jhs1969,
I would definitely go ahead and purchase the G17 with the factory 'plastic' sights and then replace them with a quality aftermarket vendor sight of your choice (good ones that come to mind are: Trijicon, Heinie, Warren, 10-8).
As a gunsmith I have not had an issue with any of the aftermarket sights I have put on my personal Glock pistols (usually Heinie or 10-8) or any of those put on customers Glocks. Granted, my guns probably see a higher round count than a lot of my customers guns do...however I do have a few customers who shoot IDPA with their Glocks and they see some pretty high round counts. The main issue is to make sure the front sight is properly installed and definitely use blue locktite. If installed properly you shouldn't have any issues with a quality aftermarket front sight coming loose.
As far as lubricants are concerned, I would use whatever quality firearms lubricant you prefer. I personally use a lot of SLiP 2000 products, but there are other lubricants that will work just as well. Some guys do use grease to lubricate Glocks, but I have never tried it. You should be fine with grease if you choose to use it, as long as you keep it away from the firing pin channel...that could cause some issues. The only grease I can personally recommend would be TW-25B which is an excellent product...I personally use it on 1911s though.
+1 on what gotm4 said. The copper colored stuff on the underside of the slide is factory applied anti-seize compound and should not be reapplied. I believe the manual states it should be allowed to wear off, but I have seen it removed through normal cleaning and it hasn't caused any issues.
Never Forget Those Who Died
Never Forget Those Who Killed Them
The Road March is the crucible in which the soul is refined. Pulling the trigger is easy. Humping the load over the distance is where you find out who will be on the ambush site to pull the trigger with you. The Road March defines you. Never quit. Come in ugly if you have to, but come in.
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