Check the listing for details. KIDD Auto Bolt Release and Bolt Hold Open for a 10/22® or Ruger® 10/22®. Condition: New. Listed at 17.50 USD. Upgrade your 10/22® bolt hold open to an auto bolt releaseRack the bolt with a simple pullNo gunsmith required for installationManufactured from steel cut by laser The KIDD Auto Bolt Release will replace your factory bolt hold open in the 10/22® trigger. This upgrade will allow the shooter to simply pull back on the bolt handle when the bolt is locked back to allow the bolt to go forward. No more fiddling with the factory bolt hold open to allow the bolt to go forward. All KIDD trigger units come with the auto bolt release as standard, but this product can be used to upgrade your current factory trigger. Replacement instructions:With the trigger removed from the receiver push the ejector pin and magazine release latch pin 1/3 of the way out starting from the bolt hold open side of the trigger. Pull out the current bolt hold open then slide in the KIDD Auto Bolt release. Push the two pins back through. Check if it functions correctly by depressing the portion close to the magazine release lever to see if the top side of the auto bolt release toggles up. Package includes:Auto Bolt Release