I have owned a SX-M1 since I bought it new in 1976, replaced the bolt buffer last year (old one was brittle and chipping out little hunks of plastic), own a M-2 Benelli and it is the easiest semi-auto to break down and clean I have ever had my hands on. My favorite is the Browning Auto-5, own two now and have owned two in the past I no longer own - I just cannot beat them for a great fit. Never owned a REM 1100, but did own a Sportsman 58, same fit, a decent gun but not as reliable as the others (to include the 1100).