Pretty often we could hear that Polish 5.56 Fabryka Broni Łucznik-Radom MSBS/GROT assault rifle is a blatant copy or replica of FN Herstal SCAR-L or Remington ACR (formerly Magpul Masada). The truth is that since more over 100 years, most of the firearms are sharing same design solutions. We have decided to compare SCAR and MSBS side by side to find out how much of SCAR we are going to find in the MSBS.
The 5.56 FN Herstal SCAR-L was designed around eight years earlier before the MSBS and from the outside, Polish rifle might be somehow similar to the Belgian weapon. The purpose of this article is to prove or deny this statement. FRAG OUT! MAGAZINE was able to compare 1:1 commercial versions of both FN SCAR-L (sold as SCAR 16S) and FB Radom MSBS (the rifle is sold under GROT S16 FB-M1, because Polish military adopted the rifle as GROT C16 FB-M1. In this article we are going to use MSBS name as it is more common outside of Poland). Government, select-fire variants are slightly different, but those differences does not have any impact on overall design or layout.
Both SCAR and MSBS are semi-automatic (or select-fire), gas operated, short stroke piston rifles with rotating bolts as most of the modern rifles. Absolutely nothing ground-breaking here.
The main differences are in the details, including gas blocks and bolt carrier groups. SCAR features two-position gas block with lock which prevents accidental removal. In MSBS, the gas block has two working positions and one position for removal or replacement. There is only a slight resistance between working and removal position, so it might be accidentally released. This is most criticized part of the weapon. SCAR has foldable front sight attached permanently attached to the gas block. The MSBS has iron sights attached to the MIL-STD-1913 rail.