School me on pre ban super 90'?

[snooter]

Single long tube an a "a" prefix..i have 3 hk marked super 90's and have no clue what makes a pre ban benelli super 90..thank you...

[M1014]

if the gun was built before 1994 i believe,that when a ban law came into affect,about large capacity mags,import stuff,etc maybe somelse can help also.