PKM, DShK, and Uk Vz. 59 all use non-disintegrating reusable metallic links.
The PKM and Uk Vz. 59 sets are in 50 round increments, and are not compatible with one another even though they use the same cartridge. (PKM shares link types with SG43 I believe).
2 link together per clip-on assault box for PKM (100 rounds).
1 belt of 50 in the box for the Uk Vz. 59 assault box.
Those serve the same role as the "nut cup" cloth sack used by our SAW gunners - ready in the weapon as a teaser belt for rapid reaction response / offensive assault. Once in position (or if em-placed in a defensive role), the 200 or 250 round ammo boxes come out for reloads. Those are 4x linked belts of 50.
The tripod of the PKM shown is the later type, VERY lightweight, but a pretty cool design that's fast to set up and has some nice features. It's worth covering on it's own write-up. It can be converted from low positioned tripod with traverse and elevation adjust or set up in an AA configuration where it has 360 degree rotation and high attack angle capability.
I haven't been able to locate a Czech tripod for the Uk Vz. 59 yet so can't comment on that. (It is on my list...)
Here's a vid of me firing an actual PK (post-sample)
[YOUTUBE]UGvxYGcOfAY[/YOUTUBE]
As you can see it feeds on the right side, ejects on the left, which is opposite of the FN Minimi design we use.
The Uk Vz. 59 ejects down, and feeds from right side. It's faster to load than the PKM, as it does not require the dust cover to be lifted for the first round to be positioned. Just pull the starter tab though, cock, and go.
The barrel change on the Uk Vz. 59 is fast but not as fast as the PKM. On the PKM, the bipod remains on the gun, which is the only reason the PKM is faster at changing barrels (you don't have to support the gun with something else during a barrel change). On the Uk. Vz. 59 the bipod is on the barrel. This leaves the users in the unfortunate position of 1- carrying spare barrels WITH bipods attached (more weight), or 2 - trying to swap out the bipod on a barrel change with a hot barrel. To remove the bipod you have to remove the muzzle device and the bipod slips off the front. (Front sight is also part of the bipod).
Since the front sight and bipod are a "unit", in order to make sure the UK Vz. 59 is zeroed for each replacement barrel the bipod and front sight must be swapped with the barrels; so the spare barrel supply is going to be heavier for people to lug around. The PKM has the front sight affixed to the barrels, which means you can "zero" each barrel for that specific gun before deployment. It uses the same adjustment / drift tool as the AK-47 to zero the elevation and windage on the front sight. Once zeroed the rear tangent sight is used.
The Uk Vz. 59 has a flip up rear sight, adjustable out to a very optimistic 2,000 meters. Unlike the PKM, it has a windage adjustment built in to the rear sight. Both elevation and adjustment on the Uk. Vz. 59 are done via thumb screws.
Loading the UK Vz. 59 belts are a chore, by hand. I haven't been able to track down a linker for it.
I have a linker for the PKM which works reasonably well, and fast (once I got the cosmoline off .. jeesh that thing was all sorts of gooped up.)
The linker for the PKM ammo belts is about the size of a US 50 BMG ammo can and can load a 50 round belt in about 20 seconds. (Takes longer to get the ammo out of the Russian spam cans than it does to link...)