Here's some more good info to know about Gen 3 Glocks. The Navy Seals recently added the Glock 19 to their "approved arsenal," and specified Gen 3 Glock 19. Here's why: All Gen 3 Glocks have a single coil guide rod. Gen 4 and above have the captured double coil. The double has the propensity to collect debris and malfunction quicker than the single coil. You can imagine the Seals are often getting sand and seaweed, ocean junk into their side arms. The Gen 3 keeps functioning longer than Gen 4, according to all their field testing and comparisons. Then, I already told you about the Glock 23 - how easy it is to convert it. A Glock 23 is 3 guns in one. 9mm, 40 caliber, and 357 Sig. It comes from factory a .40, but 9mm and 357 Sig conversion takes less than 60 seconds.