A failure to fire can occur at any time and for myriad reasons. And, depending on the rifle, having the right tool for the job can quickly rectify such a stoppage. U.S. Tool and Design’s Manual Bolt Extraction Device can be tapped with a hammer to apply leverage and force against the bolt carrier group of an AR-15-style rifle, easily freeing a seized bolt. Price: $35. Contact: U.S. Tool and Design; ustoolanddesign.com.