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My only experience was with a early model delta elite. The plastic recoil spring guide broke after about 50 rounds. I also read in a publication that maybe one of our members can help me recall its name. A copy was given to me about a year after the Delta elites came out. Basically what this publication did was buy guns and gear off the shelf, shoot or abuse them till they broke, ran elaborate tests on them then wrote a recommendation. I never had a subscription because it was a couple hundred dollars a year. They took no advertisement or sponsorship of any kind. I don't even know if they are still in publication. What I remember from that issue was Deltas the guide breaking was the first to go. With imaging they were able to detect microfractures in the slide at about 150 rounds. On their test gun the sear broke at around 250 rounds.
I really have no idea about the Glock and how it would hold up. With those pressures I would be real concerned about an unsupported chamber.
I also don't know if the Deltas have improved or not. I sold mine 15 years ago and never missed it. Personally I have not found Colt quality to be that great in recent years.
My final recommendation is to call Alex Hamilton or email him at Ten Ring precision in San Antonio. He handles all of my pistolsmithing work and is a super great guy. He also writes for American Handgunner and will most likely point you in the right direction.
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Allen
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