Well I found my own answer. Brownells sells a nifty picatinny rail for the benelli and other mfgs that has six screws mounting to receiver through top radius on sides so you avoid the thinned metal on top of receiver. It is not the typical clunky looking saddle mount. part # 483-100-007 manufactured by Da-Mar
Brownells also sells the Practical type compensator with interchangeble choke tubes for $89 plus $34.95 for chokes IC,M,F
pheasnat phool