Fully rifled choke tubes increase the versatility of your Remington shotgun and improves accuracy with today's high performance sabot-type slugs. Best performance can be expected from sabot-type sugs like Remington Copper Solid, BuckHammer, and Premier Core-Lokt Ultra Bonded Sabot slugs. Foster-type lead slugs are best shot through Improved Cylinder chokes. Best accuracy when used with adjustable rifle sights or scopes. Machined from solid billet 17-4 stainless steel. Made in USA.