GFR 5.56x45 NATO Stratomatch Rifle The Geissele Freedom Rifle (GFR) Stratomatch Rifle features the latest weapon technology, available exclusively from Geissele Automatics. Designed and Engineered from the ground up, the GFR is the next evolution of the AR15 platform. The GFR Stratomatch rifle features a 416R stainless steel cut-rifled barrel, precision machined in-house. One of the engineering innovations Geissele has accomplished for these barrels is the barrel extension, now with feed ramps specifically designed for the 5.56x45 NATO cartridge. This new barrel extension is also elongated to extend into the receiver, which improves accuracy by providing a more rigid, monolithic Mfg: Geissele Automatics Llc