Fabryka Broni from Radom, Poland (FB Radom) presented yesterday latest prototypes of MSBS assault rifle.
Rifle is first component of upcoming family of modular weapon system that will include rifle, carbine, sub-carbine, SPR and magazine fed automatic rifle (light machine gun) both in classic and bulpup configuration. Both configurations are designed to have about 80% parts compatibility, so some design features of presented MSBS are influenced by upcoming bulpup.
MSBS is operated by short stroke adjustable piston system with rotating bolt - operating system similar to most modern assault rifles. Externally it shows influence of SCAR or ACR. Unfortunately, due to paten process reasons picture of disassembled MSBS does not include bolt carrier with bolt. Rifle is fully ambidextrous, with both sides fire selectors, magazine release buttons, charging handles (non reciprocating, but with ability to use as forward assist), bolt release (in front of triggerguard) and user configurable direction of extraction. Only features that are "fixed direction" are right folding of stock (rifle works good with folded stock) and left opening of grenade launcher that is developed specially for MSBS.
Shooting leaves very good impression (http://youtu.be/xlZlHoSy2zQ). What is most noticeable is that rifle shoots very flat, with little to no tendency to muzzle rise (depending on grip and stance used) and is very controllable in full auto fire.
Some pictures:
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