-RS-2US is, indeed a beam rider and not SARH.
-R-55 is indeed an improved late IR version of K-5
-Wikipedia is Wikipedia, so take those range figures with a grain of salt at least. But those big ranges mean high altitude range of missile, where it will have less drag and will have much longer range than lower altitudes, of course I still would not expect even half of 30 km value even then. Note, that there 4 variants of this particular missile in sim, with fairly different capabilities :
* R-3S : AIM-9B copy, requires miracles and divine intervention against agile targets
* R-3R : Same missile with SARH guidance
* R-13M : Improved missile with longer range, larger warhead, better seeker, seeker and missile both can track targets pulling more Gs, and missile itself can pull more Gs, can be fired while launching aircraft pull about 3.5G, where R-3S can only be shot while pulling about 1-2G. Though, it is still a rear aspect only missile.
* R-13M1 : Further improved, roughly equivalent to rear aspect only AIM-9P versions.
-K-13 does, indeed have longer kinematic range than R-60, advantage of R-60 is, it is more agile, can be shot when closer to target, can be shot while pulling as many Gs as you like and still track. Also, R-60M is kind-of all aspect, seems it can't aquire head-on, but can lock and engage from most other target aspects.
-It was GUV gunpod, it didn't make the release, but it wouldn't really be that efficient to be honest, same pod that Mi-8 can carry, it has one 12.7 mm and two 7.62mm gatlings, almost strictly against soft targets. Overkill against softs, almost useless against hards
UPK-23 is available, and a better option all around. I agree that it is cool, but it is just that, and nothing more
So far I've found that for ground attack, and putting nukes aside, best option is S-24 rockets. Kh-66 is also nice and fun, but to use against vehicle size targets I honestly am not sure whether it brings any real advantages over S-24 option, and is more complex to utilize. If targets is large like a bridge, building or ship, where you can put your pipper on from a distance with ease, than Kh-66 of course is better.
S-5 rockets aren't very powerful, but are a decent option as well, and you can carry a lot of those (though watch out not to drop those pods by pulling too hard from dives, so far, I do that all the time :D)
Bombs are nice but, due to the fact that only way to get an accurate pipper is a shallow dive, which will bring you very close to target to get that pipper, and the fact that MiG is not quite a dive bomber at all, I've found them to be very finicky to employ. Though, I am trying toss bombing, it may be a fun option, it works with Nuke, so may be with some improvement may work with ordinary bombs too
(slight jab at DCS : I'd really love if we could set burst time for cluster bombs... it would be awesome to toss them... it is a real shame, currently all cluster bombs besides CBU-97 and CBU-105 feel almost useless, and those are useful only because of guided submunitions)
GSh-23L Gun itself, (and presumably gunpods since they are the same GSh-23) is fairly decent when you can hit the targets, but, it has quite short range compared to other things we are used to strafe with, and as mentinoed before, MiG isn't quite a dive-attack platform, so gun strafing can be effective but tricky, and induces a large chance of lawn darting
