"Russian BARS unit organization?" Topic

I was curious about the organization and equipment of the Russian army combat reserve units (BARS). What's the largest unit of organization for the BARS (brigade, battalion, etc)? Are they predominantly infantry or do they also have armored or artillery units or elements? What kind of equipment do they ideally field (and I realize at this point of the war it's less than ideal and most likely less than uniform)? Thanks for any input!

Now such information is not readily available. It is possible to draw conclusions from indirect information from various publications.
The main organizational unit is the battalion.
The number is within 500-600 people.
Composition – mostly people with military training before entering the service. In fact, BARS is an analogue of PMCs under the auspices of the Russian Ministry of Defense. In peacetime, these people periodically undergo military training to maintain their military skills, in wartime they replenish the army.
There is no official information on the composition of the battalion, but it can be concluded from publications that they are armed with light armored vehicles (armored personnel carriers or infantry fighting vehicles) and mortars. I think the organizational staffs largely repeat the structure of a standard Russian motorized rifle battalion.
In addition, most of these battalions are sponsored either by the authorities of the regions where they are created, or by various organizations (for example, Cossack unions) and these bosses provide them with various support, both financial and material.
This is where you can see a lot of "mobilized" civilian transport. These are either cars confiscated from criminals, or vehicles purchased at the expense of sponsors. These vehicles are transferred from sponsors (regions or organizations), as well as uniforms, household items and the like.
In addition, in the composition of the BARS, you can see many soldiers of respectable age (about 40 years old), who have already left the regular service due to their length of service.
In terms of combat qualities, BARS is quite high, because the vast majority consists of veterans of various wars and conflicts. For example, BARS-13, consisting of LPR veterans (who have been fighting since 2014), last fall staunchly defended Krasny Liman, the defense of which allowed the Russian front to be stabilized after the Ukrainians broke through under Balakleya and the Russians retreated from Izyum.

Thanks for the insight Cuprum, it's much appreciated. As you said, it's very hard to track down information on the BARS composition.