Buffer and spring assembly for a firearm
First Claim
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1. A buffer and spring kit for a firearm comprising:
- a. a buffer including a buffer housing defining a sleeve portion, a collar portion, and a shoulder portion, wherein the shoulder portion has a first diameter that is less than 0.78 inch, and the sleeve portion has a second diameter smaller than the first diameter, the shoulder portion being located between the sleeve portion and the collar portion; and
b. a helical spring extending between a first end and a second end, the helical spring being configured for mounting to the buffer such that the sleeve portion and shoulder portion can extend within an interior space defined by an internal diameter of the helical spring with the first end abutting the collar portion and with the helical spring being in direct contact and in an interference fit with the shoulder portion as the helical spring internal diameter is less than the buffer shoulder portion first diameter;
c. wherein the helical spring is formed from at least two strands of wire that are twisted together and wrapped to form the helical spring having a constant spring rate of about 1.78 pounds per inch, wherein the helical spring has a free length of about 11 inches, and wherein the helical spring has a first compressed force of about 7.24 pounds when compressed to a first length of about 6.74 inches and has a second compressed force of about 14.25 pounds when compressed to a second length of about 3 inches.
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Abstract
The present disclosure provides a buffer kit or assembly for an AR-15, M16, M4 carbine, SR-25, AR-10 and LR-308 type firearm with enhanced fatigue resistance. The buffer assembly includes a weighted buffer, a spring, and a buffer tube. The spring is helically shaped and is formed from multiple wire strands. The stranded wire spring has a greater nominal wire diameter, in comparison to prior art single wire springs, and thus the stranded wire spring itself has a smaller internal diameter. The shoulder of the weighted buffer is provided with a reduced diameter to accommodate the smaller internal diameter of the stranded wire spring.
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Citations
22 Claims
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1. A buffer and spring kit for a firearm comprising:
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a. a buffer including a buffer housing defining a sleeve portion, a collar portion, and a shoulder portion, wherein the shoulder portion has a first diameter that is less than 0.78 inch, and the sleeve portion has a second diameter smaller than the first diameter, the shoulder portion being located between the sleeve portion and the collar portion; and b. a helical spring extending between a first end and a second end, the helical spring being configured for mounting to the buffer such that the sleeve portion and shoulder portion can extend within an interior space defined by an internal diameter of the helical spring with the first end abutting the collar portion and with the helical spring being in direct contact and in an interference fit with the shoulder portion as the helical spring internal diameter is less than the buffer shoulder portion first diameter; c. wherein the helical spring is formed from at least two strands of wire that are twisted together and wrapped to form the helical spring having a constant spring rate of about 1.78 pounds per inch, wherein the helical spring has a free length of about 11 inches, and wherein the helical spring has a first compressed force of about 7.24 pounds when compressed to a first length of about 6.74 inches and has a second compressed force of about 14.25 pounds when compressed to a second length of about 3 inches. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A buffer and spring assembly for a firearm comprising:
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a. a buffer including a buffer housing defining a sleeve portion, a collar portion, and a shoulder portion, wherein the shoulder portion has a first diameter that is less than 0.78 inch, and the sleeve portion has a second diameter smaller than the first diameter, the shoulder portion being located between the sleeve portion and the collar portion; and b. a helical spring extending between a first end and a second end, the helical spring being mounted to the buffer such that the sleeve portion and shoulder portion are within an interior space defined by an internal diameter of the helical spring and the first end abuts the collar portion, and such that the helical spring is in direct contact and in an interference fit with the shoulder portion as the helical spring internal diameter is less than the buffer should portion first diameter; c. wherein the helical spring is formed from at least two strands of wire that are twisted together and wrapped to form the helical spring, wherein each of the at least two strands of wire has a diameter of about 0.045 inch, and wherein the at least two strands of wire have a twist pitch of about 0.475 inch. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A buffer and spring kit for a firearm comprising:
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a. a buffer including a buffer housing defining a sleeve portion, a collar portion, and a shoulder portion, the shoulder portion having a first outside diameter and being located between the sleeve portion and the collar portion, wherein the first diameter of the shoulder portion is less than 0.78 inch; and b. a helical spring extending between a first end and a second end, the helical spring being configured for mounting to the buffer such that the sleeve portion and shoulder portion can extend within an interior space defined by an internal diameter of the helical spring with the first end abutting the collar portion and with the helical spring being in direct contact and in an interference fit with the shoulder portion as the helical spring internal diameter is less than the buffer should portion first diameter; c. wherein the helical spring includes about 24.5 active coils and a free length of about 11 inches; and d. wherein the helical spring is formed from a first wire, a second wire, and a third wire that are braided together to form a stranded wire, wherein each of the first, second, and third wires is a steel wire having a diameter of between 0.042 and 0.052 inch, wherein the stranded wire has a twist pitch of between about 0.43 and 0.52 inch. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification