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End plate sling adapter securable to a rifle for a sling, includes a fastener element, sling adapter clamp and locking insert. Sling adapter clamp has a collar defining a central opening extending therethrough, and a pair of fastener housings arranged at respective ends of the collar defining a gap

End plate sling adapter securable to a rifle for a sling, includes a fastener element, sling adapter clamp and locking insert. Sling adapter clamp has a collar defining a central opening extending therethrough, and a pair of fastener housings arranged at respective ends of the collar defining a gap therebetween. Each housing receives a fastener therein such that the fastener extends across the gap and is adjustable to reduce its width. Locking insert has an upper portion with a threaded cradle accommodated within central opening and meshing with a threaded portion of a rifle buttstock receiver extension, and a lower portion extending into the gap.

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1. An end plate sling adapter comprising: a fastener element;a sling adapter clamp for a receiver extension of a buttstock assembly of a rifle, having a collar defining a central opening extending therethrough, and a pair of fastener housings arranged at respective ends of the collar defining a gap

1. An end plate sling adapter comprising: a fastener element;a sling adapter clamp for a receiver extension of a buttstock assembly of a rifle, having a collar defining a central opening extending therethrough, and a pair of fastener housings arranged at respective ends of the collar defining a gap therebetween, each fastener housing receiving the fastener element therein such that the fastener element extends across the gap and is adjustable to reduce a width thereof; anda locking insert having an upper portion accommodated within the central opening and a lower portion extending into the gap between the pair of fastener housings. 2. The adapter of claim 1, wherein the fastener element is a screw. 3. The adapter of claim 1, wherein the central opening includes a generally cylindrical portion dimensioned to closely accommodate a portion of a rifle buttstock assembly therein. 4. The adapter of claim 3, wherein the central opening further includes a generally wedge-shaped portion accommodating the upper portion of the locking insert. 5. The adapter of claim 4, wherein the upper portion of the locking insert includes a cradle further defining the cylindrical portion of the central opening. 6. The adapter of claim 1, wherein the sling adapter clamp further includes a ridge on an inner surface of the collar partially surrounding the central opening. 7. The adapter of claim 6, wherein the ridge forms a reduced diameter portion of the central opening, the reduced diameter portion dimensioned to closely accommodate a receiver extension of a rifle buttstock assembly. 8. The adapter of claim 7, wherein the upper portion of the locking insert includes a cradle effectively continuing the ridge and further forming the reduced diameter portion of the central opening. 9. The adapter of claim 8, wherein the cradle is threaded. 10. The adapter of claim 1, wherein the upper portion of the locking insert includes a threaded cradle. 11. The adapter of claim 10, wherein the upper portion of the locking insert further includes a threadless cradle adjacent to the threaded cradle. 12. The adapter of claim 1, wherein the lower portion of the locking insert includes a tab inserted into the gap between the fastener housings. 13. The adapter of claim 12, wherein a notch is defined in the tab and the fastener element extends through the notch. 14. The adapter of claim 12, wherein the lower portion of the locking insert further includes a flange approximately perpendicular to the tab and overlying respective faces of the fastener housing. 15. The adapter of claim 14, wherein the respective faces of the fastener housing are recessed faces. 16. The adapter of claim 14, wherein the flange includes a locking stop protruding from a front face thereof. 17. The adapter of claim 1, wherein the sling adapter clamp and the locking insert are molded from rigid plastic material. 18. A method of attaching an end plate sling adapter in accord with claim 1 to a rifle, the method comprising: arranging the sling adapter clamp around a receiver extension of a buttstock assembly of the rifle;positioning the locking insert into the sling adapter clamp; andtightening the fastener element in the sling adapter clamp to securely engage the receiver extension between the sling adapter clamp and the locking insert. 19. The method of claim 18, wherein positioning the locking insert into the sling adapter clamp is performed after arranging the sling adapter clamp around the receiver extension. 20. The method of claim 18, wherein the sling adapter clamp is configured such that tightening the fastener element urges the locking insert into engagement with the receiver extension. 21. The method of claim 18, wherein the locking insert includes a threaded cradle, the sling adapter clamp and locking insert are positioned to align the threaded cradle with a threaded portion of the receiver extension. 22. The method of claim 21, wherein the locking insert includes a threadless cradle, and the sling adapter clamp and locking insert are positioned to align the threadless cradle with a receiver extension nut. 23. The method of claim 18, wherein the locking insert includes a flange with a locking stop protruding therefrom, and the sling adapter clamp and locking insert are positioned such that the locking stop engages an end plate of the buttstock assembly. 24. The method of claim 18, wherein the sling adapter clamp includes a collar defining a central opening extending therethrough and having a ridged portion on an inner surface thereof partially surrounding the central opening; and the sling adapter damp and locking insert are positioned such that a non-ridged portion of the collar is aligned with a receiver extension nut. 25. An end plate sling adapter comprising: a fastener element;a sling adapter clamp having a collar defining a central opening extending therethrough, and a pair of fastener housings arranged at respective ends of the collar defining a gap therebetween, each fastener housing receiving the fastener element therein such that the fastener element extends across the gap and is adjustable to reduce a width thereof;a locking insert having an upper portion accommodated within the central opening and a lower portion extending into the gap between the pair of fastener housings, the upper portion of the locking insert includes threads for meshing with a threaded portion of a receiver extension of a buttstock assembly of a rifle;the central opening includes a generally cylindrical portion dimensioned to closely accommodate a portion of a rifle buttstock assembly therein and a generally wedge-shaped portion accommodating the upper portion of the locking insert;the upper portion of the locking insert includes a cradle further defining the cylindrical portion of the central opening; andthe sling adapter clamp and locking insert are molded from rigid plastic material. 26. The adapter of claim 25, wherein the sling adapter clamp further includes a ridge on an inner surface of the collar partially surrounding the central opening, the ridge forming a reduced diameter portion of the central opening, the reduced diameter portion dimensioned to closely accommodate a receiver extension of a rifle buttstock assembly; and the locking insert including a threaded cradle effectively continuing the ridge and further forming the reduced diameter portion of the central opening. 27. The adapter of claim 25, wherein the lower portion of the locking insert includes a tab inserted into the gap between the fastener housings, a notch is defined in the tab and the fastener element extends through the notch.