FB MSBS Grot

Infobox weapon | name = FB MSBS Grot | image = MSB (standard).png | caption = MSBS Grot C16 FB-M1 | type = Assault rifle (MSBS Grot C)Bullpup assault rifle (MSBS Grot B) | service = | wars = Russian invasion of Ukraine | designer = Adam Gawron, Bartosz Stefaniak, Grzegorz Misiołek, Maciej Sajdak | design_date = 2007 | production_date = 2007–2017 (prototypes)2018–present | number = | spec_label = | length = (Grot C, stock extended) (Grot B) | action = Short-stroke gas piston, rotating bolt | image_size = 300 | origin = Poland | is_ranged = Yes | used_by = See Users | manufacturer = FB "Łucznik" Radom | variants = See Variants | weight = (Grot C) (Grot B) | part_length = (Grot S) (Grot S) | width = | cartridge = 5.56×45mm NATO7.62×39mm | rate = 700–900 rounds/min | velocity = | range = | feed = 30-round detachable 5.56×45mm STANAG NATO magazines, 60-round casket magazine30-round 7.62x39mm STANAG magazine | sights = Integrated Picatinny rail for various optical sights and Picatinny attachable iron sights The FB MSBS Grot (Modułowy System Broni Strzeleckiej „Grot”, Modular Firearm System "Spearhead") is a family of modular assault rifle developed and manufactured by FB "Łucznik" Radom. Early prototypes were known as the MSBS-5.56 Radon. There are two basic variants of the MSBS Grot: a conventional configuration assault rifle and a bullpup configuration. The MSBS is the first machine carbine fully designed and produced completely in Poland since World War II as well as the largest firearms sale contract taken on by the Polish arms industry since 1989. The MSBS program was in development since 2007 by the Military University of Technology (WAT) in Warsaw with cooperation from the firearms manufacturer FB Radom, and was designed to replace the FB Beryl rifle used by the Polish military since 1997. During initial tests conducted by the Military University of Technology, the MSBS-5.56 and its counterpart HK416 were subjected to comparative testing of the barrel and hand-guard for overheating during an intensive firing schedule.