What would be a good quad rail to go with, that is inexpensive and has the "extension" piece that meets up with the picatinny on the upper so it looks like one complete rail? This is for a carbine length LMT Standard Patrol Model. I looked at a Mako, an AR Tach and some others that were under $150....some I saw were in the $40-$60 range. I just can't spend a lot on this right now because I want to get a nice stock also. Are these inexpensive quad rails generally worthless? Break easy, loose fit etc? Also, is the idea to get a 2 piece rail hand guard? Are some of these a single piece and if so are they hard to install? Thanks.