Over-gassed 11.5.. cut to 10.5 help at all??

[munch520]

Doesn't sound like much of a gain.. (reduction)

Maybe I can get Iraqgunz to stop by the house today when he's out running his ponzi schemes throughout the city.

agreed, doesn't sound like much return after a pretty drastic change. .02" for 1".

True... might be worth a cutdown just for the research value.

I'd be curious to hear as well. To me, sound like Ironman's suggestion is the easiest and most practical. Syrac blocks ain't cheap, but I'd rather do that then send my barrel out. And after shipping/shop fees...you'd probably net out at around the same $...but have more flexibility with the adjustable GB?

[markm]

Ok, boys.

The Gas port is .082... Talk to me!

[Ironman8]

Ok, boys.

The Gas port is .082... Talk to me!

That's big even for a 10.5"

Did it come that way from the factory? Or is that from erosion?

You may need a heavy buffer and some extra power springs for that puppy!

[RyanB]

LMT 10.5 is .071... You're screwed.

Sabre?

[Clint]

You're not screwed.



Taking the LMT 10.5 port size down a hair to compensate for the extra inch would make the port size you'd like the barrel to have around .069".

One of our insertable gas ports would make it right.

[munch520]

That's big even for a 10.5"

Did it come that way from the factory? Or is that from erosion?

You may need a heavy buffer and some extra power springs for that puppy!

Damn. I'd agree...+ a LMT enhanced carrier (not bolt). And never suppress it

[markm]

You're not screwed.



Taking the LMT 10.5 port size down a hair to compensate for the extra inch would make the port you'd like the barrel to around .069".

One of our insertable gas ports would make right.

Please expound.

I've never heard of an insertable gas port. I'd like to keep the fixed FSB, but am willing to cut the barrel down to balance the scales.

[Robb Jensen]

Have it cut to 10.5" and run a H3 buffer and it should run well with a gas port of .082"

[Clint]

Please expound.

I've never heard of an insertable gas port. I'd like to keep the fixed FSB, but am willing to cut the barrel down to balance the scales.

Sure,

Inside the gas block or FSB there is passage that goes between the barrel and gas tube.

Call it the gas transfer port.

The insertable gas port goes inside that passage and reduces gas flow to the desired level.

The effect is similar to an adjustable gas block or switchblock, except it is not adjustable or switchable without removing the FSB and putting a different port in.

This is very much in line with the original intent of the system to not require operator adjustments to the gas system.

IMO, No need to cut down the barrel by 1".

I doubt it will make enough of a difference in gas flow.

[Magic_Salad0892]

You can band-aid it enough to get a healthy 10k rounds out of that barrel without killing your bolt.

Options:

Insertable gas port.
LMT Enhanced Carrier
Heavier buffer in the A5
Stiffer Spring (I like the Springco GREEN M16 spring)
Maybe a stronger extractor would be good too.

The bolt should last 5k. I'm sure of it. I'd also like stronger magazine springs if I was gonna run something like that.

But then again, I'd take these procautions on ANY SBR.