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questar sells the ghost connectors.... get the one without the overtravel, to me it makes little to no difference and is a pain to shave and test, shave and test.... more hassle then it is worth.
I think the Glock part is still the best.
A 3.5# connector with a NY-1 Spring.
Detail strip and do the 25 cent trigger job, which is just polishing, no stoning http://www.alpharubicon.com/mrpoyz/glock/
It makes a world of difference.