In reply to GarethSL: No, no, and NO.
It'll absolutely not work.
The 19G are too bloody small for standard rock climbing use, let alone being used with extendable slings and that's even before thinking about handling them with gloves...
Only really two sensible uses for them:
- mountaineering routes where you're either only going to use runners for a short crux pitch out of a massive long route or you're 90% sure a rack won't be used at all but you can't quite justify not carrying one.
- a few back-up draws on a "Gogarth style" rack where you ideally want to carry 20 draws just in case and having perhaps 4 of them as 19Gs is a reasonable compromise.
I've used draws with extendable slings with loads of different karabiners in both Summer and Winter. For Summer use, relatively small krabs like Ocum Kestrels, Camp Nano (or DMM Phantoms if you're feeling flush) work, just. However even in Summer I find them fiddly and greatly prefer full-size krabs paired with slings. For Winter, I wouldn't consider anything other than the still unsurpassed Wild Country Helium or something equally large and easy to handle.
However, if you are not already using them, Mammut 8mm Contact slings are absolutely the best option, hands down, for 60cm extendable draws. Although for ice routes, especially on double ropes, the majority of my rack would be normal 'fixed' quickdraws rather than extendable draws.
If you're that bothered about weight, there are half a dozen better ways to save it:
Lighter Helmet - e.g. Petzl Sirrocco
Thinner ropes - e.g. 6.9mm twins, 7.3mm doubles or an 8.5/7mm single
Smaller, lighter pack - e.g. Arc'teryx Alpha FL30
Alloy bodied ice screws (e.g. Petzl) instead of all steel
Fixed point crampons instead of modular
Lighter slimline harnesses
And that's before considering the simple expedient of just taking less gear, which is generally just the simplest option.