The aluminum-frame R51 in 9 mm Luger was introduced in 2014, but issues with internal tolerances and the magazines led Remington to a full recall. With the issues fixed, the R51 is back and being made in Huntsville, Ala.The R51 features a 3.4” barrel and weighs in at 22 ozs., and uses a hybrid delayed-blowback system called a “Pedersen hesitation lock.” You can learn exactly what this means in Wiley Clapp's feature article on the new R51, which appeared in the October issue of American Rifleman. Or watch Editor-in-Chief Mark Keefe explain it in this week's NRA Gun of the Week video. For more, visit remington.com for more.