10.5 barrel and buffer recipe

[Jwknutson17]

I've had good success with a standard carbine extension and running a H3 with blue SpringCo spring.

I prefer a BCM A5 extension with the H3 and a green SpringCo spring.

Yes, the A5 with A5H3 /green is a great combo.

[Doc. Holiday]

I've had good success with a standard carbine extension and running a H3 with blue SpringCo spring.

I prefer a BCM A5 extension with the H3 and a green SpringCo spring.

I've heard a few things about the Blue Springco spring. Good to hear that you have had good success with it personally! What barrel are you running SWAT?

[HeruMew]

Doc, my experience is use an H2 buffer (carbine RE) or A5H2 (A5 RE) and adjust the gas accordingly. If you start with an over sized gas port, you're already behind the power curve.

HeruMeru, VLTOR makes a pistol A5 RE that can be used with a brace.

I have seen them, just haven't invested the time or money into it. Thank you nonetheless, may be time to do that as the A5H4 and Green Sprinco are significantly smoother than the H4 carbine.

What 10.3/5 barrels do you know of that are .060 ? Or barrels that are even smaller then .069 that are not cut down?

As I had mentioned, I have seen Centurion arms 10.5 is on the lower side of .06.

I never said I could quote barrel manufacturers providing such, but figured a smaller gas port (with some due research on OP's end) may serve them better in the long run.

Nonetheless, Centurion is the only one I can think of off the top of my head with the small gas port from manufacturer.

Buffer weight does not increase dwell time.

I see your post was edited to be nicer.

Thank you, I don't know what it said before, but either way, I must have miscoined this term. I was under the impression if the mass is greater and the mass ultimately is slowed down, the gasses have more unlock timing and slows down the reciprocation giving the bolt more time to dwell.

I've seen, with one of my uppers, that a stock Carbine buffer would run very quickly, in strings it would fail to strip the next round. This issue was corrected with the heavier buffer. I was under the impression that the... "time frame" of the bolt moving and staying at the rear of the buffer tube for those fractions of seconds is referred to as dwell time. But, I really wouldn't doubt I am misusing that terminology and certainly wouldn't allow my ego to not be humbled with a little education.

Nonetheless, thanks for being nice about it, I assure you it was a mistake if misused and appreciate the moment of grace.

[MistWolf]

Buffer weight does not increase dwell time.

That depends on which dwell time you're talking about. If you mean the time it takes the bullet to travel from gas port to muzzle, you're right. But that dwell time has little, if anything, to do with the function of an AR.

But the buffer weight does have an affect on the time it takes to get the reciprocating mass moving and that does matter.

However, my experience is, if you don't get the gas flow right, it won't matter how much reciprocating mass you use. If you do get the gas flow right, choosing the right buffer becomes very simple.

[markm]

Adding the can will certainly change things. Going to an H3 is pushing it for our tastes. Heavy buffers suck under rapid fire. Too much reciprocating mass.

If you're not running a fixed FSB, an SLR adjustable is much better than heavy buffer "pop".

[Doc. Holiday]

Ya I planned on getting an adjustable GB when I get my can. Should I just start with one and skip the Geissele? I've heard a lot about the SLR. Anyone's thoughts on the Odin works?

[markm]

Should I just start with one and skip the Geissele? I've heard a lot about the SLR. Anyone's thoughts on the Odin works?

.073" will run with a can, but you'll probably have a bit of excess bolt speed. I would start out with an SLR... but I'm obsessed with correct gassing, and completely over the game of using heavy buffers.

[Doc. Holiday]

Exactly, I just want to have a reliable rifle that isn't being over worked(within reason since its a MK18 inspired)

[Pappabear]

Yes, the A5 with A5H3 /green is a great combo.

A5 system is just something special. You can change buffers as needed and there is no downside.

I used my first adjustable gas block and liked it. It was an SLR. I always thought those things had two settings Can on can off, This one can be changed on the fly, but it just has notches to click until you get your load shooting soft as possible and the BCG locks back. I don't think its design is for changing all the time, its to get the perfect gas system in place.

Again, A5

PB

[JEL458]

My primary duty rifle has been a 10.5" LMT with FSB. I run a SF SOCOM RC2 w/ SF brake. I have used it with an H, H2 and an H3. I currently (last 3 years) use an H2. I really couldn't tell a difference between them recoil or reliability wise.