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Sanity check needed before ordering heavier buffer

This is a discussion on Sanity check needed before ordering heavier buffer within the AR Talk forums, part of the Long Gun Talk category; I'm new to the AR platform. I have a complete LMT 16" with a carbine length gas system. Upon inspection, the spent brass is a ...

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Old 01-22-2010, 12:45 PM   #1
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Sanity check needed before ordering heavier buffer

I'm new to the AR platform. I have a complete LMT 16" with a carbine length gas system. Upon inspection, the spent brass is a little beat up on the bottom around the primer, and they also show a small nick on the side of the casing.

LMT tells me it has a carbine buffer from the factory.

I'm not worried about reloading, but after some research think it might be beneficial to install a heavier buffer to slow down the cycling. This may add to longevity and reliability. Worst case if it does nothing I'm out a $30 buffer.

Carbine buffer 3 ounces.
H buffer 3.8 ounces
H2 buffer 4.7 ounces
H3 buffer 5.6 ounces

I have a standard weight AR bolt and am leaning towards the H2 buffer. Will be placing the order tonight.

Any input or experience to share?
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Old 01-22-2010, 03:02 PM   #2
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How far and where is the brass being ejected? Buffer might not help.
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Old 01-22-2010, 03:47 PM   #3
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I run a Spikes ST-T2 buffer in my 16 carbine length rifle with FA BCG with no problems. the common response is run the heaviest buffer that will cycle with all the ammo you shoot. The bad part to that is unless your like mike (mvician) you probably don't have a pile of them to swap out and test. H2 should run fine, lots of people run them. H3 and heavier... just depends on your rifle.

Standard CMT carbine buffer - 2.9 oz.

CMT H buffer - 3.8 oz.

CMT H2 buffer - 4.1 oz.

Armalite H3 buffer - 4.7 oz.

RRA 9mm buffer - 5.5 oz.

ST-T2 buffer - 4.3 oz.

ST-X SS 9mm buffer - 6.0 oz.

ST-9X SS Extended 9mm buffer - 8.5 oz.

ST-SST - 7.0 oz.
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Old 01-22-2010, 04:27 PM   #4
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I run H2 in all my guns.
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Old 01-22-2010, 04:34 PM   #5
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Quote:
Originally Posted by Mercmar View Post
How far and where is the brass being ejected? Buffer might not help.
I've only been to a pretty confined range so far. Unfortunately was unable to see where the brass would land on its own if it didn't hit something.

Thanks for the responses all.
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Old 01-22-2010, 04:55 PM   #6
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I would try an H buffer and move from there if need be. You could also swap in a FA BC for like 100 bucks or so, but thats obviously about 80 more than a buffer swap.

Ejection Path - M4Carbine.net Forums
check out post #10 for a diagram on how to fix where you brass is landing.
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Old 01-22-2010, 06:19 PM   #7
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Quote:
Originally Posted by rjacobs View Post
I would try an H buffer and move from there if need be. You could also swap in a FA BC for like 100 bucks or so, but thats obviously about 80 more than a buffer swap.

Ejection Path - M4Carbine.net Forums
check out post #10 for a diagram on how to fix where you brass is landing.
Great information. After looking at the chart I've decided to check the ejection pattern before buying parts. Going to require a trip to the desert!
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Old 01-22-2010, 07:37 PM   #8
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Yep...Check Ejection Distance...Might Be Overfunction Problem

Or perhaps the word is over cycle. Until we can figure out if your brass is being kicked out of the gun too far, they is no way we can determine what is causing the problem with your brass.

For whatever it is worth, the carbine length barrels SHOULD have a smaller gas port hole. This is because the pressure curve where the gas is tapped off for the gas tube is highter.

But...what ends up happening a lot of times is that the barrel manufacturer just drills the gas port holes diameters all the same on either rifle or carbine length barrels.

OK for a rifle, but on a shorty carbine, lots of times this lets too much gas into the carrier group thru the tube and key, making the gun overfunction. Hard on the entire gun. HB of CJ (old coot)
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Old 01-23-2010, 01:54 AM   #9
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Here's a chart with weights of the various buffers out there.


I went with the RRA 9MM buffer in my carbine and my CavArms lower.

In addition the carbine has a Young's NM carrier which is a little heavier than a standard carrier. Even with all that extra weight, my 16" carbine runs fine, even when very dirty.

If you go to a H2 or RRA 9MM in your gun it should run fine. It should run smoother with less percieved recoil.
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Old 03-06-2010, 08:29 PM   #10
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I'm glad I checked where the brass was landing before ordering any more parts.

I tested on Winchester 55 grain 5.56 and ATI 62 grain 5.56, and found that Winchester ejected at 4 o'clock and ATI at 4:30. Both flew approximately 10 feet (fired from a bench).

If it ain't broke..............
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