The Colossic 10/22 auto bolt lock is for holding the bolt closed through the firing process for the stock Ruger 10/22. The auto bolt lock is sprung closed unless manually opened by hand to cycle the next round. This gives the Ruger 10/22 the same functionality as a bolt action rifle. There is no simi-auto functionality with this version. This can make a Ruger 10/22 comply with Boy Scout rifle requirements.