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Old February 14th, 2020, 08:25 PM #1
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Buffer Setup for SBR

Finally getting around to building one of my SBR lowers. I'm looking for a buffer/spring/extension for this combo and not sure which direction to go?

Here's the specs thus far:
- Spikes billet lower and upper
- BCM BCG
- BCM Gunfighter CH
- Ballistic Advantage 10.5" barrel 0.750
- Geissele MK13 rail 9.5"
- Geissele Super gas block
- Spikes Melonited Carbine Gas Tube

I will probably run this suppressed 50% of the time. Can someone suggest a decent buffer/spring combo as a starting point? I was thinking VLTOR A5 but not sure...

TIA!
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Old February 14th, 2020, 10:02 PM #2
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Quote:
Originally Posted by snallygaster View Post
Finally getting around to building one of my SBR lowers. I'm looking for a buffer/spring/extension for this combo and not sure which direction to go?

Here's the specs thus far:
- Spikes billet lower and upper
- BCM BCG
- BCM Gunfighter CH
- Ballistic Advantage 10.5" barrel 0.750
- Geissele MK13 rail 9.5"
- Geissele Super gas block
- Spikes Melonited Carbine Gas Tube

I will probably run this suppressed 50% of the time. Can someone suggest a decent buffer/spring combo as a starting point? I was thinking VLTOR A5 but not sure...

TIA!
I have 4 5.56 SBRs. They all have Mil-Spec springs and H2 buffers. 2 of them are ran suppressed the majority of the time. No issues here.
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Old February 14th, 2020, 10:11 PM #3
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Quote:
Originally Posted by rouchna View Post
I have 4 5.56 SBRs. They all have Mil-Spec springs and H2 buffers. 2 of them are ran suppressed the major of the time. No issues here.
OK. I wasn't sure if H2 or H3 was the way to go. Thanks for your input.
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Old February 15th, 2020, 06:58 AM #4
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Quote:
Originally Posted by snallygaster View Post
Finally getting around to building one of my SBR lowers. I'm looking for a buffer/spring/extension for this combo and not sure which direction to go?

Here's the specs thus far:
- Spikes billet lower and upper
- BCM BCG
- BCM Gunfighter CH
- Ballistic Advantage 10.5" barrel 0.750
- Geissele MK13 rail 9.5"
- Geissele Super gas block
- Spikes Melonited Carbine Gas Tube

I will probably run this suppressed 50% of the time. Can someone suggest a decent buffer/spring combo as a starting point? I was thinking VLTOR A5 but not sure...

TIA!
Not a giant fan of the G super gas block. Being as you will be suppressing the gun at times, I would consider an adjustable GB. Your gun will thank you.
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Old February 15th, 2020, 09:35 AM #5
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Originally Posted by outrider58 View Post
Not a giant fan of the G super gas block. Being as you will be suppressing the gun at times, I would consider an adjustable GB. Your gun will thank you.
This.

SLR adjustable gas block.
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Old February 15th, 2020, 10:06 AM #6
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This.

SLR adjustable gas block.
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Old February 15th, 2020, 10:07 AM #7
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Sprinco Blue and an H2 buffer is my go to for a well balanced suppresses/unsuppressed setup
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Old February 15th, 2020, 10:28 AM #8
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Quote:
Originally Posted by dmable44 View Post
Sprinco Blue and an H2 buffer is my go to for a well balanced suppresses/unsuppressed setup
Interesting site...

https://www.sprinco.com/ar-buffer.html
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Old February 15th, 2020, 12:03 PM #9
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When the AR15 was originally developed the barrel length and twist rate, gas system, bcg weight/design, buffer system, locking system cartridge, powder, barrel, chambering, projectile, etc were all designed to work together. All that is a bit daunting to optimize for those of us home builders that are prone to overthinking things.

I use superlative arms gas blocks, mostly in bleed off mode. Seems to be the best balance of adjusting dwell time and letting excess gas bleed off due to backpressure, too large a gas port, variable ammunition, etc. I can suppress something like my 18" 2 gun rifle without any major changes, but with a shorter barrel rifle I prefer to optimize with the suppressor as part of the system.

Not sure what size gas port Ballistic Advantage is using for which barrels. In general it is hard to predict what will be optimal for a given setup without a lot more detail and testing. In general a VLTOR A5 with the A5 buffer and an H1 or H2 will get you "good enough", and a Springco Blue + H2 will get you there too. Overall 5.56 ARs are pretty forgiving about being overgassed, so it is probably not a major concern.
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Old February 15th, 2020, 03:16 PM #10
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Itís been a spell since Iíve handled my 11.5Ē AR......but I believe I have an H3 with sprinco blue, and of course an SLR adjustable.

Once the gas setting was dialed in, it was dead nuts reliable and pretty soft shooting.


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