30 inch's of pipe here on my Ithica Mag10!!Exactly as poult stated, the extra length helps in my powder(IMR4756) burning clean with my own heavy magnum handloads!

i have a browning a500-g that carlson's chokes cut to 22" and installed a turkey tube and a rem exp super mag 26" barrel.i like the short 22" best.

Let's see... I had a 24 and liked it... the gun was all black and I traded it off for a full camo version. It has a 21 and it works well... but I find that I prefer the longer sight plane. Anyone have a new stlye MOB camo barrel for an 870 longer than 21 that they want to trade? This 21 inch is equipped with Remington's fully adustable Tru-glo style sights... factory model... not an add-on. Like 'em short? Drop me a line.

26 Inch Barrel 1 Inch Sticking Out From Choke Tube When I Get It.
Remington 870 Express