Heavy buffer for .308 AR

[Cactus_Tim]

I am looking at buying a heavy buffer and spring to try in my .308 since it has the same problem as the one in this thread: AR10 kept jamming on me

Does anyone have a recommendation between the CAR-10 Buffer - 5.5 ounces vs the CAR-10 XH Buffer - 6.5 ounces?

http://heavybuffers.com/ar10carbine.html

I initially considered a 4.5 oz buffer, but am wondering if the 5.5 or 6.5 would be a better choice.
(Yes, I am googling and reading, but would appreciate your input)
I'm currently running a 3.5 oz buffer with adjustable gas block, but I'm sure the buffer is too light.

I'm considering the XH buffer for maximum recoil reduction.
Especially after my recent shoulder surgery.
Though I won't be shooting until my doctor says it's okay.

Let me know what you think.

[HDHNTER]

I have run Slash's XH in my Mk11 for years, big fan!

[Cactus_Tim]

That's the one I'm thinking of getting.

[FeuerFrei]

Something doesn't sound right.
Has an adjustable gb and still needs a heavy buffer?

Methinks the gb isn't dialed in or cannot be because it may only have presets that don't allow finer tuning.
I have only used JP enterprise gb's on all my LR308 barrels and it has been a predictable formula for me regarding reliability and smooth operation using standard weight 308 buffers.

What kind of gb??

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[Cactus_Tim]

It's the odin adjustable gas block.
and I'm sure it's not dialed in right, yet.
But I've been working on it.
I go from fully closed and slowly open it up but haven't found the sweet spot yet.
It jams the next round into the spent casing.

I'm thinking I should introduce a heavier buffer into the mix.
Then go back and start tuning it from scratch again.

Possibly heavier extractor spring as well.
I'll have to dig out my spent brass and check for extractor marks.

[FeuerFrei]

I'd stay with it until you find reliable lock back/cycle.

No handloads. Just ball ammo until things loosen up.

Adding some new buffer will only make things more variable when troubleshooting it.

Get it to run in a standard config and then experiment. If things go sideways you can always return to the last known good condition that works.
Good luck.



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[Cactus_Tim]

I thought I had it dialed in for one magazine after running about 5 mags through it.
Then it went back to jamming.
I even made sure to run it wet.
After several mags and slow incremental adjustments, the jams continue.
That's why I thought an increase in buffer weight might be worth considering.
Doesn't a 3.5oz buffer seem a little light?

My last build smoothed out after about 100 rds and has been reliable since.
But it has a rifle stock and buffer, so it's different than the carbine version I'm running now.

[FeuerFrei]

Odin gb w/setscrews?
See if it moved on you.

Check the gas key cap screws while you're at it.

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[Milsurps]

I use as I said in the other thread.

CAR-10 Buffer + .308 Carbine Buffer Spring
In my very over gassed BR-308 w/ A pinned gas block.
Runs like a clock now.

Adding this into your mix at this time would not be the best choice.
Certainly not the XH. IMHO

Continue to find the sweet spot on the Adj gas block.
More often than not, it's a good fix.

[Cactus_Tim]

Well, I'll try it as is and work on the adjustments when I am able to get out with it again.
I just thought that a 3.5 oz buffer seemed a little light on a 308.
Thus the reason for my post.

Thanks for everyone's input.

[Rocketrob]

Springco Orange Spring

[gemini1]

As others have suggested, just keep adjusting the gb using factory ammo till you find the sweet spot. I replaced the weight inserts on my car buffer with bb pellets to reduced weight on my lightweight 308 build, and just adjusted a home built adjustable gb, and it works great. No ftf using 10 round pmags, though I'm still getting ftf on 2 10/20 mags, which maybe mag issues. Could your problems be mag related?

[Mr. Torgue]

I am looking at buying a heavy buffer and spring to try in my .308 since it has the same problem as the one in this thread: AR10 kept jamming on me

Does anyone have a recommendation between the CAR-10 Buffer - 5.5 ounces vs the CAR-10 XH Buffer - 6.5 ounces?

http://heavybuffers.com/ar10carbine.html

I initially considered a 4.5 oz buffer, but am wondering if the 5.5 or 6.5 would be a better choice.
(Yes, I am googling and reading, but would appreciate your input)
I'm currently running a 3.5 oz buffer with adjustable gas block, but I'm sure the buffer is too light.

I'm considering the XH buffer for maximum recoil reduction.
Especially after my recent shoulder surgery.
Though I won't be shooting until my doctor says it's okay.

Let me know what you think.

I have the heavy in mine but all of this depends on barrel length and gas system length. The shorter the system the heavier the buffer weight you want to slow down the speed of the bolt cycling. An extra heavy on a 20 inch barrel with a rifle length gas system will have cycling issues, especially if you're shooting low power rounds.

Edit: Having looked at your other thread, you said you have an SR762 clone, that means it uses a short stroke piston right? Is it possible to put an adjustable gas block on there? Have you checked the gas port for plugging? Maybe some of the ammunition was dirty? Have you tried 308 loads? They run hotter than 7.62 Nato. I think if your extractor is fine, next most likely issue ammo or cleanliness of the gas port. A heavier buffer might make your problems worse.

[Cactus_Tim]

It's an 18 inch mid length gas system.
I plan to put a couple hundred more rounds through it as I slowly adjust the gas block one click at a time and see how it works out.

It's just slow going, having to drop the mag and clear the jam after each shot or every other shot.
I'm thinking of backing down to zero and opening it up 6 or 7 clicks (out of 22) and see what it does.

[Mr. Torgue]

It's an 18 inch mid length gas system.
I plan to put a couple hundred more rounds through it as I slowly adjust the gas block one click at a time and see how it works out.

It's just slow going, having to drop the mag and clear the jam after each shot or every other shot.
I'm thinking of backing down to zero and opening it up 6 or 7 clicks (out of 22) and see what it does.

And once you find a setting that works, it will run for a few rounds then have several jams? What do you do with the rifle to find that sweet spot again? Do you pull the rifle apart and clean, do you just start back at zero? To me it sounds like an ammo and fouling issue.

I think the regular heavy buffer would work with a midlength better than the extra heavy ones.