Grimburg O’Rings


Upgrade for the stock FSC o’ring and Milsig Heat Core O’Rings.

24 in stock (can be backordered)


Turn up the velocity on your First Strike FSC, T8.1 or T9.1 without blowing out the firing bolt O’ring. Much stronger than stock o’rings. Also an upgrade for Milsig Heat Core O’Rings. Pack of 3. We include 3 for piece of mind but, you’ll probably never need the other two.

Additional information

Weight 1 oz
Dimensions 2 × 2 × 1 in