HELICAL GAS RING - MK4 SKU: UPC CODE:MSRP: N/A MAP: N/A Available Quantity: $2.58 Quantity -+ Add to Order Details Helical Gas Ring Replacement helical gas ring for AR-15. Description: Replacement helical gas ring for AR-15 Details Back Details Helical Gas Ring Replacement helical gas ring for AR-15. Description: Replacement helical gas ring for AR-15 Ratings & ReviewsNo reviews availableBe the first to Write a Review