I have for sale a used BCM MK18/CQBR upper. I bought it brand new from BCM as an 11.5 upper and sent it off to ADCO to get it cut back to 10.5". It has 500 trouble free rounds thru it. It includes a (new) BCM MOD4 Gunfighter charging handle and a BCM Full Auto BCG. $950 Cash IM or email for any questions.