Browning T-Bolt MagazinesT Bolt Double Helix Magazine A groundbreaking design that assures excellent feeding. Quality Browning parts. 10 round capacity Ingenious and highly reliable. Slimmer, lighter and easier to handle than the competitions rotary rimfire magazine, the ten round Double Helix uses a torsion drive spring and interlocking gear design to maintain correct timing and exact cartridge alignment for smooth, reliable feeding. The translucent gray body allows for easy