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.
Black Gunpowder Magnetic Quick Release Buckle One-Handed Operation DIY – Z2 Bros LLC
Down River Equipment
Quick Release Cam Buckle Spring Loaded Rapid Adjustable Dentation Clip Fit 25mm Webbing 2 Point Rifle Sling Hunting Accessories - AliExpress
2x16' Int. Van Strap w/ Cam buckle, Spring E fittings and Wire hooks
Spring Loaded Cam Buckle Rapid Enhanced Rubberized Ribbed Grip Pull Tab Adjustable 2 Point Rifle Sling Hunting Accessories - AliExpress
1 Cam Buckle – Austere Manufacturing
16' Cam Buckle Logistic Tie-Down Strap - Gray
ITW/AB Rapid Adjust Spring Loaded Cam Buckle For Rifle Sling DIY
The USA Ratchet's Patented Spring Loaded Cam Buckle straps will make your job easier. Just attach the S-Hooks to anchor points and pull tight! The
1 x 12' Spring Loaded Cam Buckle Strap with Keeper S Hooks
12' Cam Buckle Logistic Tie-Down Strap - Yellow