A telescopic recoil system for a firearm having a receiver and a bolt carrier includes a recoil system base, an axle fixed to the base, a central buffer tube slidably mounted on the axle, an axle buffer spring between the base and central buffer tube, biasing the central buffer tube away from the ba
A telescopic recoil system for a firearm having a receiver and a bolt carrier includes a recoil system base, an axle fixed to the base, a central buffer tube slidably mounted on the axle, an axle buffer spring between the base and central buffer tube, biasing the central buffer tube away from the base, an outer tube slidably mounted on a forward portion of the central buffer tube, a spring buffer tube slidably mounted on a rearward portion of the central buffer tube, a rear buffer spring between the base and spring buffer tube, biasing the spring buffer tube away from the base, a central spring between the spring buffer tube and outer tube, biasing the outer tube away from the spring buffer tube and away from the base and an exchangeable spring between the outer tube and the bolt carrier, biasing the outer tube away from the bolt carrier.
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1. A telescopic recoil system for a firearm having a receiver and a bolt carrier (33) movable rearwardly in the receiver during an initial part of a firing cycle, and forwardly in the receiver during an ending part of the firing cycle, the recoil system comprising: a recoil system base (13);an axle
1. A telescopic recoil system for a firearm having a receiver and a bolt carrier (33) movable rearwardly in the receiver during an initial part of a firing cycle, and forwardly in the receiver during an ending part of the firing cycle, the recoil system comprising: a recoil system base (13);an axle (17) fixed to the base (13);a central buffer tube (21) slidably mounted on the axle (17);an axle buffer spring (2) engaged between the base (13) and the central buffer tube (21) for biasing the central buffer tube (21) away from the base (13);an outer tube (23) slidably mounted on a forward portion of the central buffer tube (21);a spring buffer tube (19) slidably mounted on a rearward portion of the central buffer tube (21);a rear buffer spring (4) engaged between the base (13) and the spring buffer tube (19) for biasing the spring buffer tube (19) away from the base (13);a central spring (6) engaged between the spring buffer tube (19) and the outer tube (23) for biasing the outer tube (23) away from the spring buffer tube (19) and away from the base (13); andan exchangeable spring (8) engaged between the outer tube (23) and the bolt carrier (33) for biasing the outer tube (23) away from the bolt carrier (33). 2. The telescopic recoil system of claim 1, wherein the central spring (6) and the exchangeable spring (8) have a biasing force sufficiently lower than the rear buffer spring (4) to allow a reload movement of the bolt carrier (33) to occur, whether the rear buffer spring (4) and the axle buffer spring (2) are compressed during a buffering movement of the bolt carrier (33) or not. 3. The telescopic recoil system of claim 1, wherein the recoil system base (13) includes a base portion (13a) having an axial bore (13c), and a threaded connection plug (15) having a plug portion (15a) with a base extension (15b) extending into the axial bore (13c) and a threaded portion (15b) threaded into the axle (17). 4. The telescopic recoil system of claim 1, wherein the axle (17), the central buffer tube (21), the outer tube (23) and the spring buffer tube (19) each have selected relative lengths that permit the bolt carrier (33) to execute a reload movement and a buffering movement in the receiver. 5. The telescopic recoil system of claim 1, wherein the rear buffer spring (4) has a higher compression resistance than the central spring (6) so that the rear buffer spring (4) compresses later than the central spring (6) during a firing cycle. 6. The telescopic recoil system of claim 1, wherein the spring buffer tube (19) includes a flange (19a) for separating the rear buffer spring (4) from the central spring (6) on the spring buffer tube (19). 7. The telescopic recoil system of claim 1, wherein the outer tube (23) includes a flange (23a) for separating the central spring (6) from the exchangeable spring (8) on the outer tube (23). 8. The telescopic recoil system of claim 1, wherein the central buffer tube (21) has a large outside diameter forward end (21a) and the outer tube (23) has a small inside diameter rearward end (23b) for engaging the large outside diameter forward end (21a) of central buffer tube (21) retain the central buffer tube (21) to the outer tube (23). 9. The telescopic recoil system of claim 1, wherein the axle (17) has a large outside diameter forward end (17a) and the central buffer tube (21) has a small inside diameter rearward end (21b) for engaging the large outside diameter forward end (17a) of axle (17) retain the axle (17) to the central buffer tube (21). 10. The telescopic recoil system of claim 1, wherein the exchangeable spring (8) has a length that keeps a forward end of the outer tube (23) spaced from a forward surface (32) of the bolt carrier (33) before a firing cycle, the exchangeable spring (8) compressing during a firing cycle until the forward end of the outer tube (23) contacts the forward surface (32) of the bolt carrier (33), the bolt carrier (33) moving rearwardly in the receiver during the firing cycle until a rearward surface (44) of the bolt carrier (33) contacts a stop surface (42) of a bolt carrier stop part (31) in the receiver. 11. The telescopic recoil system of claim 1, wherein the exchangeable spring (8) has a length that keeps a forward end of the outer tube (23) spaced from a forward surface (32) of the bolt carrier (33) before a firing cycle, the exchangeable spring (8) compressing during a firing cycle until the forward end of the outer tube (23) contacts the forward surface (32) of the bolt carrier (33), the bolt carrier (33) moving rearwardly in the receiver during the firing cycle until a rearward surface (44) of the bolt carrier (33) contacts a stop surface (42) of a bolt carrier stop part (31) in the receiver, the rear buffer spring (4) and the axle spring (2) having a compression strength compared to the central spring (6) for compressing mostly during a later part of the firing cycle. 12. A telescopic recoil system for a firearm having a receiver and a bolt carrier, comprising: a recoil system base;an axle fixed to the base;a central buffer tube slidably mounted on the axle;an axle buffer spring between the base and central buffer tube, biasing the central buffer tube away from the base;an outer tube slidably mounted on a forward portion of the central buffer tube;a spring buffer tube slidably mounted on a rearward portion of the central buffer tube;a rear buffer spring between the base and spring buffer tube, biasing the spring buffer tube away from the base;a central spring between the spring buffer tube and outer tube, biasing the outer tube away from the spring buffer tube and away from the base; andan exchangeable spring between the outer tube and the bolt carrier, biasing the outer tube away from the bolt carrier. 13. The telescopic recoil system of claim 12, wherein the central spring and the exchangeable spring have a biasing force sufficiently lower than the rear buffer spring to allow a reload movement of the bolt carrier to occur, whether the rear buffer spring and the axle buffer spring are compressed during a buffering movement of the bolt carrier or not. 14. The telescopic recoil system of claim 12, wherein the recoil system base includes a base portion having an axial bore, and a threaded connection plug having a plug portion with a base extension extending into the axial bore and a threaded portion threaded into the axle. 15. The telescopic recoil system of claim 12, wherein the axle, the central buffer tube, the outer tube and the spring buffer tube each have selected relative lengths that permit the bolt carrier to execute a reload movement and a buffering movement in the receiver. 16. The telescopic recoil system of claim 12, wherein the rear buffer spring has a higher compression resistance than the central spring so that the rear buffer spring compresses later than the central spring during a firing cycle. 17. The telescopic recoil system of claim 12, wherein the spring buffer tube includes a flange for separating the rear buffer spring from the central spring on the spring buffer tube. 18. The telescopic recoil system of claim 12, wherein the outer tube includes a flange for separating the central spring from the exchangeable spring on the outer tube. 19. The telescopic recoil system of claim 12, wherein the central buffer tube has a large outside diameter forward end and the outer tube has a small inside diameter rearward end for engaging the large outside diameter forward end of central buffer tube retain the central buffer tube to the outer tube. 20. The telescopic recoil system of claim 12, wherein the axle has a large outside diameter forward end and the central buffer tube has a small inside diameter rearward end for engaging the large outside diameter forward end of axle retain the axle to the central buffer tube.
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