Claude built my conversion 1100 in .410. It is a darn sight more reliable than the original factory 1100 .410s. My 28 gauge 870SC Purbaugh conversion is without a malfunction in I can't imagine how many years. I bought my Purbaugh .410 at an auction where it was advertised as a 20 gauge because that's what it said on the Remington barrel. No one took the time to look down the barrel.