Shop › KYNSHOT BUFFER FOR 300 BLK AR-15 KYNSHOT BUFFER FOR 300 BLK AR-15 $149.99 KynSHOT RB5000L Hydraulic Recoil Buffer, Fits AR-15 in 300 Blackout with Mil Spec Carbine Buffer Tube, Stainless Steel Construction, Silver RB5000L Quantity: Add To Cart Added! KynSHOT RB5000L Hydraulic Recoil Buffer, Fits AR-15 in 300 Blackout with Mil Spec Carbine Buffer Tube, Stainless Steel Construction, Silver RB5000L