My Maxus looks to have steel rails machined into the aluminum reciever, don't have a magnet small enough to check it with. Nice gun, puts a LOT of #6 hevi-13 from 3" 1-5/8oz loads on 8X11 paper at 40 yds with trulock .670" turkey choke, 1-1/2oz #5's were OK but the #6's were great! giving a muuch better margin of error. I really like this gun so far, just hope that it does'nt "wear out." Gonna start patterning some steel through a Trulock , skeet#2/Light Modified choke.