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. FEATURES: Upgrade your 10/22 bolt hold open to an auto bolt release. Rack the bolt with a simple pull. No gunsmith required for installation. Manufactured from steel cut by laser. Replacem Mfg: Kidd Innovative Design