FMKGAR1E View cart “FMK AR1 Extreme Lower Receiver Polymer Multi-Caliber Black AR-15” has been added to your cart. Showing the single result Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low Sale! IN STOCKFMK AR1 Extreme Lower Receiver Polymer Multi-Caliber Black AR-15 $52.99 Original price was: $52.99.$47.69Current price is: $47.69. Add to cart