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A handguard system for use on a rifle having a barrel attached to a receiver by a barrel nut, including an adapter ring and a tubular handguard. The adapter ring is receivable about a barrel nut and changeable between a rotatable configuration where it is rotatably about the barrel nut, and a fixed

A handguard system for use on a rifle having a barrel attached to a receiver by a barrel nut, including an adapter ring and a tubular handguard. The adapter ring is receivable about a barrel nut and changeable between a rotatable configuration where it is rotatably about the barrel nut, and a fixed configuration wherein it is fixed to the barrel nut. The tubular handguard is receivable about a barrel and has an end received about the adapter ring with only the end of the tubular handguard fixedly secured to the adapter ring.

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A handguard system for use on a rifle having a barrel attached to a receiver by a barrel nut, including an adapter ring and a tubular handguard. The adapter ring is receivable about a barrel nut and changeable between a rotatable configuration where it is rotatably about the barrel nut, and a fixed

A handguard system for use on a rifle having a barrel attached to a receiver by a barrel nut, including an adapter ring and a tubular handguard. The adapter ring is receivable about a barrel nut and changeable between a rotatable configuration where it is rotatably about the barrel nut, and a fixed configuration wherein it is fixed to the barrel nut. The tubular handguard is receivable about a barrel and has an end received about the adapter ring with only the end of the tubular handguard fixedly secured to the adapter ring. aid two plates, said lifting and rotation means being activated by arranging said quarter vertically. 9. The shell according to claim 8, wherein when said quarter is placed in a vertical position, said quarter is locked in said vertical position by resting a lower end of said quarter on an underlying upper end of said two plates. 10. The shell according to claim 1, further comprising an arc-like elastically deformable bridge which frontally and transversely connects said two partially overlapping plate portions, said bridge abutting frontally against said shell and being arranged partially below said two plate portions. 11. The shell according to claim 10, wherein said bridge is connected at lateral ends thereof to each one of said two plate portions at connection regions provided at ends of front perimetric edges that cannot mutually overlap. 12. The shell according to claim 11, wherein said first rotary connection means comprises two first fixed pivots arranged within two respective first through holes which are formed laterally to said main body distally from said vertical median plane and distally from said top region adjacent to said connection regions. 13. The shell according to claim 11, wherein said guided connection means comprises two second pivots associated with said plate portions at two second through holes and sliding within two respective slots formed at a front region the heel approximately in a region above malleoli of said shell. 14. The shell according to claim 13, wherein each of said slots has a rectangular plan shape having a longitudinal axis orientated in a direction which is oblique with respect to the resting plane of said sole, thus allowing said plate portions to have a partial rotation defined by ends of said slots. 15. The shell according to claim 13, wherein each of said slots is shaped like a circular arc which is centered at said first pivot, thus allowing said plates to have a partial rotation defined by ends of said slots. 16. The shell according to claim 12, wherein a forward rotation of said plates is allowed by a deformability of said bridge proximate to said connection regions, said bridge being rigidly coupled to said main body by said first fixed pivots and abutting against a recess which is provided proximate to a tip of the shell. 17. The shell according to claim 16, wherein front ends of said two plates partially overlap each other and partially overlap said underlying bridge. 18. The shell according to claim 17, further comprising a closure device which comprises means for fastening said two underlying plates and a quarter which is rotatably associated with said shell and can rotate backward during opening. 19. The shell according to claim 13, wherein a quarter is rotatably associated with said shell in an upward region, lifting and rotation means for said two plates being formed on said quarter below a point where pivoting to said shell occurs and adjacent said slots. 20. The shell according to claim 19, wherein said lifting and rotation means comprises two protrusions which protrude toward a tip of said shell and said two protrusions each having an upper perimetric edge which is arranged in contact with a respective facing lower perimetric edge of said two plates, said lifting and rotation means being activated by arranging said quarter vertically. 21. The shell according to claim 20, wherein when said quarter is placed in a vertical position, said quarter is locked in said vertical position by resting a lower end of said quarter on an underlying upper end of said two flaps. 22. The tell according to claim 1, wherein said partially overlapping plate portions comprise two overlapping flaps each pivoted to said main body by means of respective pivots, a first one of said flaps having a stud adapted to engage a slot provided in the other one of said flaps. 23. The shell according to claim 22, wherein a second one of said flaps is connected to said main body also by means of a peg as