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Re: Which kind of carbiners shoul I use
The best carabiner shape for any kind of static rigging is a symmetric shape - oval is the best. Most carabiners are asymmetric "D" - which is stronger but will cause the line to shift when loaded - the oval shape is better because nothing will shift to one side of the carabiner when loaded. You could use standard aluminum carabiners or even locking ovals (Petzl and Omega make very nice locking ovals), but I would also suggest using steel carabiners - they are cheaper and stronger and since weight isn't an issue they are better.
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Seems these guns are kind of a convoluted mess with the way they were produced in two different factories with overlapping serial numbers, and factory markings. Here's a link to a good forum on the guns and the process by which they were marked
Typically, you'll only need to clean your carabiners by blowing any dirt or dust away from the hinge area. If any additional cleaning is necessary, then be sure to wash your carabiner in warm soapy water, and rinse it thoroughly. Once it is rinsed and dry, be sure to lubricate the gate area with a dry graphite, WD40 or other kind of lubricant. Using a dry lubricant will help to keep your carabiner clean longer, as dirty will not be readily picked up. Once the gate has been lubricated, be sure to wipe off any excess lubricant.
Depending on your style of climbing, you will want different kinds of Carabiners. There are basic types: your oval and D-shapes are your most basic Carabiners. Sometimes you'll want a locking Carabiner, especially for belay, or for anchors. Most Carabiners that you have will probably not be locking Carabiners. There are different types that are easier to clip. There's bent gates, straight gates, wire gates. It depends on your style and if you're weight conscious, or how durable you'd like them to be.