This is a chamber flag for any 12 gauge shotgun between 2 ¾" - 3 ½" chamber. I have used this on my Winchester SXP and Benelli Supernova with great results on each. The flag features text from all of our favorite red tool company, a lanyard hold on the end meant for brightly colored paracord, and a flexible point which fits in the barrel snug. The point has been optimized for both PLA and PETG printing with PETG giving a more spring-like feeling, and PLA moving much less.