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[OUTDATED][M9K][TFA] FB MSBS-B

The FB MSBS-5.56 (Polish: Modułowy System Broni Strzeleckiej kalibru 5,56 mm, English: Modular Firearm System 5.56 mm calibre) is a modular assault rifle currently developed and manufactured by FB "Łucznik" Radom to become the next service rifle of the Polish Armed Forces. There are two basic variants currently being developed that is based on a common upper receiver : a conventional variant and a bullpup variant. With its variety of modules, both variants can be easily transformed into an assault rifle, carbine, designated marksman rifle or light support weapon. The backbone of MSBS system is an inverted U-shaped receiver, made from aluminum alloy. This receiver, along with bolt group, return spring, barrel and gas system are common for both current versions of MSBS rifles. MSBS is operated using short stroke gas piston, located above the barrel, and its gas system has manual gas regulator. Breech lock is achieved by a conventional rotary bolt with seven radial lugs that lock into the barrel extension. Ejection windows are made on both sides of the receiver, and weapon can be set up to eject to either side; this requires partial disassembly of the gun and installation of the ejection port cover on the side opposite the “active” ejection window. Non-reciprocating charging handles are located on both sides of the receiver.