I own both in various models. the 535 uses standard invector tubes, i.e Browning, Mossberg, Win choke etc. The 835 is heavier, great gun for short carrying into a duck and goose blind but heavy as a 10 gauge. Over bored so better patterns, the 535 kicks harder with 3 1/2 in loads because of the tighter bore and lighter weight. After shooting and hunting with both for years I really like the 535, even though they had issues with feeding for awhile but an easy fix if you know guns. The nice thing about the 535 is that in a pinch ANY 12 gauge ammo will safely go down the pipe. The 835 doesn't digest 12 ga slugs because of the 10 gauge bore, rattle down the bore unless you shoot the slug barrel which is a standard 12 bore on the 835. I like guns that will eat any candy and the 535 is that gun without costing stupid money, and made in the USA. I have owned 870 Super Mags, 1187 Super Mags and all the others and the pump 535 has proven itself and never failed even in minus 40 degree weather with late season Canadas here in the far North.