I have a DPMS (5.56) Oracle and I would like to get a free float handguard for it. It has a railed gas block. I assume I would need to get a lower profile gas block for a handguard longer than 7"? Any recommendations as to what to look into, gas block and handguard? Not overly interested in lots of rails on it, but must be able to put bipod under it. Im leaning towards a 10" unless theres good reason to look at a different length. Thanks in advance for any help.