Maybe being a litle picky, but chambers in this gun should be 2 9/16", not 2½". While several chamber lengths were available to order "most" older American guns will have 2½" chambers in 20 & 28 ga, 2 9/16" in 16ga, & 2 5/8" in 12ga with 2 3/4" being also very common in the heavier "waterfowl" 12ga's. Do not automatically assume any early 12ga with a 2 3/4" chamber has been lengthened. By the l;ate 30's all had been more or less standardized at 2 3/4" except the 28 which was 2 7/8" for a period of time.
