Belarusian engineers are probably reusing old concepts devised decades ago as part of a "defense industry demonstration" for some officials who have no idea what they are looking at, but let's break it down anyway.
The SMAR-100
The SMAR-100 automatic carbine (it is not known what the extension of this abbreviation is) is a converted Kalashnikov bullpup design. The "good" old method was used here, in the form of leading a rod to the original trigger, and transferring the grip with the second trigger in front of the magazine. It is not known what is the origin of the reworked carbine. What is interesting, however, is the reinforced area of the barrel mount, as well as the hinged cover of the receiver equipped with a Picatinny rail.
The first raised eyebrow is caused by the fact that there is... a cheek pad mounted on the rail of the receiver's cover. The whole thing is finished with a butt plate in the place of the proper stock. In the same area, there is a trigger guard covered with a metal plate with a protruding nut. Moving a bit further forward, one can see a curved polymer suggesting the use of 7.62x39mm ammunition. Its origin is unknown.
Next, one can see an extensive handguard covered almost entirely with rectangular ports, with dimensions and shape similar to the Magpul M-Lok accessories assembly system. This would make sense were it not for the visible rivets and deformations around them, suggesting the use of a relatively thin sheet steel. This suggests that the ports are completely useless, as the material is too thin for any M-Lok compatible accessories to fit. On the back of the handguard there is a long Picatinny rail with Israeli folding iron sights by FAB Defense and a Meprolight red dot sight from the same country. The whole thing is finished with a slotted flash hider with a large thread in the rear part, which may mean compatibility with the suppressor.
The SCR-1200
There is not much to decipher in the second photo. At first glance, one can see the Dragunov semi-automatic sniper rifle. The innovation of this particular specimen is based on the installation of a number of dubious quality accessories. Going from the foreground, one can see a bipod "inspired" by solutions taken from Harris's design, available in airsoft stores for less than PLN 100. The bipod is the other way around, on a Picatinny rail, using an adapter, to a handguard with M-Lok slots. The handguard itself, with the Picatinny rail extended above the receiver, seems to be functional.
A charming addition is a small magnification telescope, probably from a well-known Chinese portal. My friend bought an almost identical one for probably PLN 220. the last thing worth mentioning is the stock and cheek pad, resembling the Magpul PRS at first glance, but set at a strange angle.
We can only congratulate the Belarusian engineers for creativity on such a limited budget. We hope that the top brass was satisfied and that no one ended up in a gulag.
(Eng. Yes, yes. It makes considerable impression on the uninitiated.)