The coaxial PKT feeds off of 250 round belts, however in all vehicles it currently acts like it's feeding off of one long continuous belt.
- Restricted Diffusion Commit
- Affected classnames
- CUP_Vhmg_PKT_veh_Noeject, CUP_Vhmg_PKT_veh_Noeject_FCS
https://en.wikipedia.org/wiki/PK_machine_gun#PKT , http://www.mayak.com.ua/en/catalogue/small-arms/kt-7-62 (actual PKT factory product description) , and http://fofanov.armor.kiev.ua/Tanks/ARM/pkt.html among a variety of others.
And here's an image for the interior of a BRDM-2, with the 250 round box magazine attached to the coaxial PKT.