Embodiments of the disclosure are directed to a rapid adjust buckle for a rifle sling. The buckle can include a main buckle portion with a pair of side portions and a handle portion extending between the pair of side portions and over the main buckle portion to define a handle aperture. In various embodiments the handle portion and the main buckle portion are a unitary piece composed of a polymer material with the handle portion being flexibly biased towards an uncompressed open shape such that the handle portion is configured to compress against the main buckle portion in response to a compressing force but return to the uncompressed open shape when the compressing force is relieved. In one or more embodiments the handle portion includes a plurality of jointed connection points configured to flatten the profile of the handle portion when the handle portion is exposed to the compressing force.