Originally Posted by WS6
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Senior Member
Member
.4", I would think. The carrier is standard length, that is the extra stroke they are claiming.
Senior Member
The Surefire OBC buffer is 2.860" inches long. The Surefire OBC is within approx .015" OAL of a BCM BCG. The longer stroke of the Surefire OBC, is because the carrier key has been cut back .400" thousands of an inch.
Last edited by Biggy; 10-02-19 at 22:48.
Senior Member
How long are carbine buffers? How much longer is an A5 buffer than a carbine one? I'd be interested in if you could run this carrier to its full stroke with a carbine buffer and A5 receiver extension giving the end user the ability to change buffer weight. I would think the spring will need consideration here, but maybe just carbine springs and buffers in the A5 tube would be the ticket?
Any way I guess I'll fid out. I ordered on to run in My 11.5" BCM barreled SBR with a Surefire Socom RC on it. The barrel has BCM largish gas port unrestricted. I previously ran a LMT enhanced carrier so I'll be comparing to that. It has the factory colt carbine receiver extension so I'll at least start with the supplied Sure fire buffer/spring and carbine extension. Likely I'll just run it as designed.
Manufacturer
Buffer data
CAR buffer is ~ 3.25"
A5 buffer is ~4.00" => .75" longer than CAR
OBC buffer ~ 2.86" => .39" shorter than CAR
An A5 tube with a .36" spacer in the bottom should allow the OBC to work with standard CAR buffers.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
Industry Professional
Agreed. I have never so much as set eyes on the A5 system but I gather from this, Clint, that with the buffer being longer, I guess the tube is longer by the same amount, right, so the stroke is the same? What with the carrier key being the actual, final, stroke limiter (as in, if it's hitting, you have a problem).
And being as how the OBC allows a .400 longer stroke, and the A5 tube is .750 deeper (right?) that's a ~ .350 dif. We need a buffer of 3.600. Putting a standard carbine buffer in there comes up .350 short. So I guess if the goal is to be able to use standard carbine buffers with the OBC, you could do it with the A5 tube IF you but a .350 spacer in there. That begs some tests of making spacers of maybe .400 or .450 that are soft and fluffy, and see how that effects the perceived cycle.
Senior Member
At some point it might be nice to compare the new Surefire system with something less expensive (and simpler) such as the buffer from Armament.
https://armamentusa.com/
As I understand it, the buffer works in a similar manner. The buffer has an internal weight that's held in place by a strong spring. The spring delays weight movement.
“The rifle itself has no moral stature, since it has no will of its own. Naturally, it may be used by evil men for evil purposes, but there are more good men than evil, and while the latter cannot be persuaded to the path of righteousness by propaganda, they can certainly be corrected by good men with rifles."
Senior Member
A bit more info:
https://www.shootingillustrated.com/...-bolt-carrier/
Last edited by Tokarev; 10-03-19 at 20:32.
“The rifle itself has no moral stature, since it has no will of its own. Naturally, it may be used by evil men for evil purposes, but there are more good men than evil, and while the latter cannot be persuaded to the path of righteousness by propaganda, they can certainly be corrected by good men with rifles."
Member
Thank you for the detailed pictures. I really appreciate it.
Member
Using an A5 RE with a carbine buffer (in conjunction with the SF carrier) is what I was getting at.
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