Sometimes referred to as a quick release cam buckles, these have been in use since the ALICE gear era and are still used on cool guy slings today.
Spring Loaded Cam Buckle 1 for 1 straps
ITW Quick Release Cam Buckle 1 With Hole
Category: Buckle - Pandatac
GREEN CAMO - 2 Point Stud Swivel connectors - Paracord Rifle or
Cam Buckles Quick Release Metal 1 Inch-wide Marpat Coyote Sold In By-The-Bag Quantities
ITW/AB Rapid Adjust Spring Loaded Cam Buckle For Rifle Sling DIY
1 Spring Loaded Cam Buckle w/ Zinc S-Hook w/ Keeper. Rated Capacity: 750 lbs
1 Spring Loaded Cam Buckle with Zinc S-Hook with Keeper (750 lbs)
Spring Loaded Cam Buckle Rapid Enhanced Rubberized Ribbed Grip Pull Tab Adjustable 2 Point Rifle Sling Hunting Accessories - AliExpress
Lift-All LoadHugger TE60806 Logistic Strap With Cam Buckle, 16 ft L x 2 in W, 800 lb Load, Spring E-Track End Style
ITW/AB Rapid Adjust Spring Loaded Cam Buckle For Rifle Sling DIY