Originally Posted by The_Real_Hawkeye
Originally Posted by Sheepdoggit
I would call Glock and inquire about sending the pistol to them to inspect. I've heard they'll take old Glocks, for example, and make sure they have all the updates they may need. I have heard of some .40 S&W issues with Glock in the past since the pistol was designed as a 9mm, not a .40 S&W or .357 SIG (as opposed to a Glock 20, 29, or 30 which were designed around the 10mm and .45 ACP cartridges. Anyway, it wouldn't hurt to play it safe and see what they have to say.

Yeah, Glock wanted to beat S&W to the punch by getting a .40 S&W chambered model out before them, so they simply put a new barrel, extractor, and magazine on the Model 17 and, voilà, objective achieved. Every other company came out with a .40 S&W specific design, and then standardized that model for both 9mm and .40 S&W, so you had overbuilt 9mms, and .40 S&W models strong enough to withstand the pressures.

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Glock addressed that problem with Gen V .40 guns. Naturally many Glock fans do not like it because new guns are heaver and do not fit into previous generation plastic holsters. As a side note certain guns were made with superior strength/wear resistance? steel barrels. Those have dot inside pentagon stamp on the barrel (Gen 3 and Gen4?). This is what Glock guys say dot stands for, however, I do not know where their information comes from. I have never handled gun with dot only seen pictures.