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Posted: 4/3/2014 11:01:48 AM EDT
[#1]
I've got more than a dozen different carbine buffers -- different weights, solid, hydraulic, pneumatic, you name it. So no, all carbine buffers definitely are not created equal.
Definitely start with a new spring, but be aware that there are more issues at play than just buffers/springs. Gas port size is another variable, as are sub-carbine-length gas tubes because they affect the gas pulse, and finally, ammo is also a variable. I generally recommend folks start with mil spec configurations with mil spec ammo and get those to run correctly, then introduce one variable at a time. YMMV. |
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Posted: 4/3/2014 12:10:56 PM EDT
[#2]
Below is a picture of some of my carbine buffers. I also have most of the A5 buffers. I now only use an H2 buffer and control the gas with my patented gas block in each upper rather that swap buffers anymore.
An H2 is all you need to eliminate bolt bounce. Going heavier is just more reciprocating mass. I only change buffers when messing with blow back operated uppers like 9mm which isn't much.  |
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Posted: 4/3/2014 12:34:47 PM EDT
[#3]
Quote HistoryQuoted:
Below is a picture of some of my carbine buffers. I also have most of the A5 buffers. I now only use an H2 buffer and control the gas with my patented gas block in each upper rather that swap buffers anymore. An H2 is all you need to eliminate bolt bounce. Going heavier is just more reciprocating mass. I only change buffers when messing with blow back operated uppers like 9mm which isn't much. http://c3junkie.com/wp-content/uploads/2014/01/buffers.jpg How is a H2 and H3 .1 ounces apart? look at the difference in H and H2 |
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Posted: 4/3/2014 12:44:27 PM EDT
[#4]
lol sorry guys, I meant are all standard carbine weight buffers the same (the same type of buffer) The reason I ask is my M16 ran fine with a standard carbine buffer, and on another carbine buffer (of the same weight) it's not functioning. Both have two tungsten weights (I believe that's the standard).
As for the gas questions this is a piston upper, 7.5" Adams arms PDW. You know, if it ran fine on that lower and not on mine, it must be one of three things. buffer, spring, or the hammer spring. I should just start swapping parts from the post sample until I find which one is the culprit. |
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Posted: 4/3/2014 1:14:06 PM EDT
[#5]
Quote HistoryQuoted:
lol sorry guys, I meant are all standard carbine weight buffers the same (the same type of buffer) The reason I ask is my M16 ran fine with a standard carbine buffer, and on another carbine buffer (of the same weight) it's not functioning. Both have two tungsten weights (I believe that's the standard). Quote HistoryQuoted:
lol sorry guys, I meant are all standard carbine weight buffers the same (the same type of buffer) The reason I ask is my M16 ran fine with a standard carbine buffer, and on another carbine buffer (of the same weight) it's not functioning. Both have two tungsten weights (I believe that's the standard). A standard "CAR" weight buffer has NO tungsten weights. Two tungsten weights would be an H2 buffer, which is the current milspec for the M4/M4A1 rifles. As for the gas questions this is a piston upper, 7.5" Adams arms PDW. Piston systems introduce massive variations in the operating cycle. Very short barrels also introduce significant variation. You know, if it ran fine on that lower and not on mine, it must be one of three things. buffer, spring, or the hammer spring. I should just start swapping parts from the post sample until I find which one is the culprit. I would not. Very short barrels are well known to be very touchy, there could be any number of factors making a difference in your setup. Most piston setups use very heavy buffers to tame the harshness of their operating cycle. I would just try an H2 or H3 to start with. |
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Posted: 4/3/2014 4:35:32 PM EDT
[#6]
Quote HistoryQuoted: How is a H2 and H3 .1 ounces apart? look at the difference in H and H2 Quote HistoryQuoted: Quoted: Below is a picture of some of my carbine buffers. I also have most of the A5 buffers. I now only use an H2 buffer and control the gas with my patented gas block in each upper rather that swap buffers anymore. An H2 is all you need to eliminate bolt bounce. Going heavier is just more reciprocating mass. I only change buffers when messing with blow back operated uppers like 9mm which isn't much. http://c3junkie.com/wp-content/uploads/2014/01/buffers.jpg How is a H2 and H3 .1 ounces apart? look at the difference in H and H2 |
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Posted: 4/3/2014 8:16:07 PM EDT
[#7]
Quote HistoryQuoted:
A standard "CAR" weight buffer has NO tungsten weights. Two tungsten weights would be an H2 buffer, which is the current milspec for the M4/M4A1 rifles. Piston systems introduce massive variations in the operating cycle. Very short barrels also introduce significant variation. I would not. Very short barrels are well known to be very touchy, there could be any number of factors making a difference in your setup. Most piston setups use very heavy buffers to tame the harshness of their operating cycle. I would just try an H2 or H3 to start with. Quote HistoryQuoted:
Quoted:
lol sorry guys, I meant are all standard carbine weight buffers the same (the same type of buffer) The reason I ask is my M16 ran fine with a standard carbine buffer, and on another carbine buffer (of the same weight) it's not functioning. Both have two tungsten weights (I believe that's the standard). A standard "CAR" weight buffer has NO tungsten weights. Two tungsten weights would be an H2 buffer, which is the current milspec for the M4/M4A1 rifles. As for the gas questions this is a piston upper, 7.5" Adams arms PDW. Piston systems introduce massive variations in the operating cycle. Very short barrels also introduce significant variation. You know, if it ran fine on that lower and not on mine, it must be one of three things. buffer, spring, or the hammer spring. I should just start swapping parts from the post sample until I find which one is the culprit. I would not. Very short barrels are well known to be very touchy, there could be any number of factors making a difference in your setup. Most piston setups use very heavy buffers to tame the harshness of their operating cycle. I would just try an H2 or H3 to start with. In the original post I mentioned an H3 buffer would not even cycle in semi. Adams arms recommends a CAR buffer only for use in their 7.5" PDW. |
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Posted: 4/3/2014 8:42:43 PM EDT
[#8]
Tomorrow I will test a few buffers I have
ST:T2 3.21oz Colt "H" 3.77oz and a number of 3oz carbine buffers That's all I have so I'll give it a shot and see what happens. |
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Posted: 4/4/2014 2:40:11 AM EDT
[#9]
Have you checked the hammer spring and make sure it's installed correctly?
I had same light primer strike and found out that the hammer spring was installed incorrectly. |
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Posted: 4/4/2014 5:26:21 AM EDT
[#10]
Quote HistoryQuoted:
Have you checked the hammer spring and make sure it's installed correctly? I had same light primer strike and found out that the hammer spring was installed incorrectly. Yes its installed correctly, no issue there. I check it's spring rate, it's a little stiffer than most, I don't see it as having any issues. I've felt a lot of hammer springs over the years, doesn't feel weak in the slightest. |
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Posted: 4/4/2014 7:38:02 PM EDT
[#11]
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Posted: 4/4/2014 7:39:41 PM EDT
[#12]
Look at that smile... PRICELESS!
Quote HistoryQuoted:
Fixed! Colt H Buffer, new carbine spring. Runs 100% https://www.youtube.com/watch?v=raJIXeHbEe4 https://www.youtube.com/watch?v=FKFK0IPcLUs |
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Posted: 4/4/2014 7:57:42 PM EDT
[#13]
Nice! What'd you decide to do about finishing your lower?
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Posted: 4/4/2014 8:24:36 PM EDT
[#14]
Quote HistoryQuoted:
Nice! What'd you decide to do about finishing your lower? Going to have ident engrave the auto selector and then have courter hall in dallas do a type 3 hard anodize. My only complaint is it *appears* the detent for the selector is slightly off. I had to hit the grip with an endmill to allow the spring to sit a little further back. Also causes my selector to not sit 180* in the semi position, slightly canted. My only gripe. I considered welding up the receiver and redrilling it, but the anodizing would probably look screwy since they don't make a 7000 series rod. |
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