I have both, get rhe carbine gas.
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Everybody always says that the carbine gas system was designed around an 11.5” gun. I’m no expert, but there were a few different iterations of that gun, with at least two barrel lengths, and I usually picture the defining version as an 11.5” with a tiny suppressor twisted on the end. In light of all that, I feel that the carbine gas system is suitable for the 12.5” guns. I could be wrong, but its working for me so far. Excepting that subsonic experiment we talked about, I don’t think I’ve had any stoppages with mine yet. They just work.
I'm curious what more experienced people would say about maxing out high power mag on a 12.5 gun. If the 1-10 has all things on 1x equal to the 1-6, I assume the only downside is cost. But I'd be curious how many people think that much mag on a short gun is stupid. Personally, 6x doesn't help with shooting groups at 100m as much as I'd hope so I feel like its viable, especially when you're talking PID and observation considerations over actual accuracy.
IMHO, I want all the magnification as long as it isnt costing you on the lower end. If your occupation involves you needing to tell whether that lump on the ground is a some dude in the prone or a rock then I'd want as much magnification as possible. If someone is using too much mag and theyre getting all this heat mirage distortion then thats a software issue not a hardware one.