SD9VE versions
I have heard that there is a difference in the 9mm sd9ve and the 9mm sd9ve with the loaded chamber indicator. Have any of you had experience or knowledge of this?
The version you refer to has a visible and tactile indicator on top of the slide so you can know whether there is a round in the chamber by a quick glance or, in the dark, by feel.
They also will not fire if there is not a magazine in the gun even if there is a round in the chamber. This prevents you from potentially firing a single round and then learning there are no more rounds immediately available. They are also required to pass a firing reliability test.
These versions usually come with a 10 round magazine to conform to some state laws but they accept the standard 16 round magazine.
Finally they would have passed a severe "drop test" to demonstrate that they won't fire if dropped accidentally.
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Here is part of the regulations defining what three sample guns must ALL pass for certification:
The laboratory must fire 600 rounds of certain ammunition from each gun, stopping at specified intervals. A handgun model passes the test if each of the three test guns:
• Fires the first 20 rounds without a malfunction that is not due to ammunition that fails to detonate
and
• Fires the full 600 rounds with no more than six malfunctions that are not due to ammunition that fails to detonate, and without any crack or breakage of an operating part of the handgun that increases the risk of injury to the user.
Following the handgun firing requirements, the same certified independent testing laboratory must subject the same three handguns to a series of six drop tests each, with a primed case (no powder or projectile) inserted into the chamber. The handgun model passes this test if each of the three test guns does not fire the primer.
If any one of the three test guns fail any of the tests, new models, representing the proposed production versions, must be submitted for a new series of tests.
The objective of these programs is to insure that models sold in those states are not only safe but are reliable.