I have my SP10 listed for sale in the firearms section and a potential buyer would like to buy just the lower. I don't want to commit to that unless I have a buyer for the upper as well. If you have a SP10 and want a second upper, here is your chance. It is a complete 18" .308 upper. I don't know the exact round count but it is low (<500 rounds). It has a 3" bipod rail added. Price is $1200 + shipping. USPS money order or certified check. No PayPal.