AR-Tenner
10-24-17, 11:41
Hi Folks,
I have been doing a lot of searching, and have not been able to come up with an answer as to the difference in load weights between the buffer springs used in a CAR receiver extension and rifle receiver extension. I am familiar with the official technical specs on them, but these only relate to the minimum and maximum length:
RIFLE: 11 3/4 Inches (29 85 cm)
minimum to 13 1./2 inches (34 29 cm)
maximum
CARBINE: 10 1/16 inches (25.56 cm)
minimum to 11 1/4 inches (28.58 cm)
maximum.
I have also seen it listed that the number of coils differs officially, with the CAR spring having 37 to 39 coils, and the rifle spring having 41 to 42 coils. This is as far as technical information and exact measurements I consider authoritative go on the differences between these springs.
I have read in various postings that the rifle spring, in addition to being longer, is also weaker, and that the carbine spring is stiffer to go along with its abbreviated cycling space. This was not official, however, and while it seems logical, I do not trust that it is true.
David Tubbs made an excellent video in which he has a pressure scale in the bottom of a modified receiver extension, and he tests and records the bolt load weight (spring pressure when bolt is closed and locked) and the spring pressure when the bolt is retracted all the way. He tested the M4 carbine springs, but did not test a rifle spring.
I was wondering whether anyone either has the technical specs of the difference in spring tension or material between the rifle and carbine springs, or has done weight tests with these different springs to test their various weights.
Thanks, and I look forward to finding out this information.
I have been doing a lot of searching, and have not been able to come up with an answer as to the difference in load weights between the buffer springs used in a CAR receiver extension and rifle receiver extension. I am familiar with the official technical specs on them, but these only relate to the minimum and maximum length:
RIFLE: 11 3/4 Inches (29 85 cm)
minimum to 13 1./2 inches (34 29 cm)
maximum
CARBINE: 10 1/16 inches (25.56 cm)
minimum to 11 1/4 inches (28.58 cm)
maximum.
I have also seen it listed that the number of coils differs officially, with the CAR spring having 37 to 39 coils, and the rifle spring having 41 to 42 coils. This is as far as technical information and exact measurements I consider authoritative go on the differences between these springs.
I have read in various postings that the rifle spring, in addition to being longer, is also weaker, and that the carbine spring is stiffer to go along with its abbreviated cycling space. This was not official, however, and while it seems logical, I do not trust that it is true.
David Tubbs made an excellent video in which he has a pressure scale in the bottom of a modified receiver extension, and he tests and records the bolt load weight (spring pressure when bolt is closed and locked) and the spring pressure when the bolt is retracted all the way. He tested the M4 carbine springs, but did not test a rifle spring.
I was wondering whether anyone either has the technical specs of the difference in spring tension or material between the rifle and carbine springs, or has done weight tests with these different springs to test their various weights.
Thanks, and I look forward to finding out this information.