NDZ's custom designed spring eliminates FSDO complete.  No sideways deflection, as springs are closed and ground offering the best performance. These will work on stock bolt guides with no modifications.

• eliminates FSDO with spring modded bolts
• works with stock bolt guides

Note: Since all makers are different, tuning adjustments should be made to achieve the best possible operation/ efficiency.

List Price: $9.99/ea
Our Price: $6.00/ea
(You Save: $3.99/ea)