Hello hopup this a knights armament urx4 handguard it can go on basically any m4 that you would like. It has a key mod rail attachment system and it has a long picatiny rail along the top this si the 10 inch version and seeing that it is $70 new I feel that $32 is a good price but I am up for negotiation. I would much rather cash but I will take a look at tr.sde just feel free to send me pictures of the item you want to tr.ade and a description please feel free to message me with any questions. PAY PAL ONLY BUYER PAYS SHIPPING