Backfin™ Finned Backstrap

Installation and Removal Instructions

IMPORTANT: You must remove the MIAD from the receiver prior to installing or removing the Backfin. Backfin will NOT latch on if the MIAD grip is installed on a receiver.

ANY MODIFICATION VOIDS THE WARRANTY. If you require assistance with installation contact us at

View into bottom of MIAD grip showing proper latching of nylon spring

  1. Be sure your firearm is unloaded!
  2. Remove all CA PC 30515(a)(1)(A-F) prohibited features from your rifle:
    • Pistol grip that protrudes conspicuously beneath the action of the weapon.
    • Thumbhole, folding, or telescoping stock
    • Grenade launcher or flare launcher
    • Flash suppressor
    • Forward pistol grip
  3. Remove your existing MIAD backstrap, and remove any grip core from the base of the grip.
  4. Slide the Backfin onto the back of the MIAD grip until the white nylon spring just touches the bottom of the grip.
  5. Depress the nylon spring with your finger and simultaneously slide the Backfin onto the grip all the way until you hear a soft "click" and see the spring latch into place.
  6. Visually confirm the nylon spring has latched by looking into the bottom of the MIAD grip (see photo above) If the spring hasn't latched you may give it a nudge by inserting a small flat bladed screwdriver into the gap between MIAD and Backfin from the bottom, and applying gentle upward pressure on the spring.  
  7. Reattach the MIAD grip to your lower receiver as usual.
  8. Reinsert grip core as desired.

REMOVAL: To remove the Backfin, first remove the MIAD grip from your rifle, remove grip core, remove the front strap, then reach down through the front strap access port and back into the bottom of the grip with a flat blade screwdriver, and firrmly depress the nylon spring while pushing down on the top of the Backfin.  The Backfin will slide right off.

To remove, reach down into the MIAD grip through the front strap access port with a tool and depress the nylon spring.

View into bottom of MIAD grip showing placement of screwdriver tip to depress spring during removal

Once the spring is depressed, slide the backfin off toward the bottom of the MIAD grip