The FB MSBS-5.56 (Modułowy System Broni Strzeleckiej kalibru 5,56 mm - Modular Firearm System 5.56 mm calibre) is an carbine currently built by Fabryka Broni "Łucznik" (Firearm Manufacture "Łucznik") in Radom to become the service firearm of the Polish Army, Air Forces and Navy.
There are two basic variants currently being developed, based on a common upper receiver: a bullpup version (signature "B" - "Bullpup") and a standard version with folding, retractable stock (signature "K" - "Classic").
Thanks to a variety of modules, both variants can be easily transformed into a subcarbine, sharpsooter rifle or squad light machnie gun.
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