This article was originally published with the title “Screw-driver Wrench and Tap Wrench” in Scientific American Magazine Vol. 105 No. 20 (November 1911), p. 433 doi:10.1038 ...

The same under barrel rail system is also available for the Glock models, 1911, P226 and Beretta 92. The system also reminds me of Wor4Tacrail, made by my mad scientist buddy David Woroner.