Great product to convert the Mossberg 500ATP over to shoot 1 3/4" shells for home defense. Installs securely in under a second. I recommend though to buy two like I did in case you need another one at some point in the future because online sales of gun parts like these are considered illegal under the Biden gun control plan on his campaign website. IF he wins, in a few months you will not be able to purchase parts like these through the mail anymore. Here in NC every one of these is sold out in the gun stores in west Charlotte and has been for some time now.