Russian Standard 5̶.̶5̶m̶m̶ ̶f̶o̶l̶d̶e̶r̶ ̶w̶/̶ ̶h̶a̶r̶d̶w̶a̶r̶e̶ ̶&̶ ̶r̶i̶v̶e̶t̶s̶(̶n̶o̶t̶ ̶p̶i̶c̶t̶u̶r̶e̶d̶,̶ ̶b̶u̶t̶ ̶i̶n̶c̶l̶u̶d̶e̶d̶)̶ and 90° square lug gas block $120.