Rifle length with carbine buffer

Helka

Helka

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Guelph,ON
I purchased a complete lower (BCM Mod 0 Carbine) and went with an 18.6" barrel (rifle length). My first build and I didn't realize the potential issue. I googled a lot and found many use this set up with little to no modification.

I want to keep the adjustable stock vs going to fixed rifle length.

Are people using this similar set up?

Also have a few questions if people are using this set up

1) Should I change the buffer from an H to the standard (3oz)
2) I have an adjustable gas block, will it need to be wide open to cycle properly, if so then I'll swap it out for a standard gas block.
3) I have yet to buy a BCG for this build. Should I stick with a standard BCG vs Lightweight BCG.

Thanks for any and all responses and help.
 
If you are using a "carbine" stock and that has nothing to do with the gas port location and gas system length. It's the style of buffer tube you have. An h2 buffer might make it under gassed a bit. As I haven't played with a h2 in an ar15 as a standard buffer and bcg work fine for me. If you go to a standard buffer I would keep the adjustable gas block. I've found that a standard buffer and bcg will be a tiny bit over gassed without the adjustable gas block. You wont have to go to a rifle length buffer tube because of your rifle length gas.
 
Last edited:
Helka said:
I purchased a complete lower (BCM Mod 0 Carbine) and went with an 18.6" barrel (rifle length). My first build and I didn't realize the potential issue. I googled a lot and found many use this set up with little to no modification.

I want to keep the adjustable stock vs going to fixed rifle length.

Are people using this similar set up?

Also have a few questions if people are using this set up

1) Should I change the buffer from an H to the standard (3oz)
2) I have an adjustable gas block, will it need to be wide open to cycle properly, if so then I'll swap it out for a standard gas block.
3) I have yet to buy a BCG for this build. Should I stick with a standard BCG vs Lightweight BCG.

Thanks for any and all responses and help.
Click to expand...

Provided you have enough gas to cycle, an adjustable gas block can be adjusted to compensate for all other variables.
 
greg olmstead said:
If you are using a "carbine" stock and that has nothing to do with the gas port location and gas system length. It's the style of buffer tube you have. An h2 buffer might make it under gassed a bit. As I haven't played with a h2 in an ar15 as a standard buffer and bcg work fine for me. If you go to a standard buffer I would keep the adjustable gas block. I've found that a standard buffer and bcg will be a tiny bit over gassed without the adjustable gas block. You wont have to go to a rifle length buffer tube because of your rifle length gas.
Click to expand...

That's the answer I was looking for, thanks
 
Helka said:
So I should stick with a standard BCG and avoid lightweight one?
Click to expand...

Lightweight carriers and buffers are for bleeding-edge competition guns. More often than not those guns teeter on the knifes edge of reliability. They are practically recoilless and generate so little jump that re-acquiring the target and placing follow up shots is nearly instantaneous. you're also looking at about a $600 - $800 expense for lightweight internals. For a "regular" shooting iron, standard internals with an adjustable gas block achieve 60%+ of what a full competition build delivers.
 
Blastattack said:
Lightweight carriers and buffers are for bleeding-edge competition guns. More often than not those guns teeter on the knifes edge of reliability. They are practically recoilless and generate so little jump that re-acquiring the target and placing follow up shots is nearly instantaneous. you're also looking at about a $600 - $800 expense for lightweight internals. For a "regular" shooting iron, standard internals with an adjustable gas block achieve 60%+ of what a full competition build delivers.
Click to expand...

ok great thanks
 
An adjustable gas block is very good for any build as you can fine tune your rifle and make it work exactly like you want, it is a wonderful thing. I would try a HH buffer like the others have mentioned and if it does give you trouble you can upgrade to a H3 buffer or an adjustable gas block, depending on what kind of problems you encounter. Your rifle should be alright though. A 18.6" barrel with carbine stock is a awesome.
 
-[Crosshair]- said:
An adjustable gas block is very good for any build as you can fine tune your rifle and make it work exactly like you want, it is a wonderful thing. I would try a HH buffer like the others have mentioned and if it does give you trouble you can upgrade to a H3 buffer or an adjustable gas block, depending on what kind of problems you encounter. Your rifle should be alright though. A 18.6" barrel with carbine stock is a awesome.
Click to expand...

Thanks for the info.
 
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