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» A Well Regulated Militia » Weaponry » Gunsmithing » what parts interchange between mid length and carbine length gas systems on an AR15?

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Author Topic: what parts interchange between mid length and carbine length gas systems on an AR15?
JWF
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Im kind of anal about spare parts and ive got only carbines right now but im thinking about getting a mid length set up ...what parts are not universal between the two systems? barrels and gas tubes are not but what about bolts, bcgs and buffers?

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Posts: 43 | From: Oregon | Registered: May 2017  | Report this post to a Moderator
Flight-ER-Doc
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Bolts and BCG's are, buffers are not.

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Emergency Medicine - saving the world from themselves, one at a time.

"Thou shalt not be a victim, thou shalt not be a perpetrator, but, above all, thou shalt not be a bystander."

I make the ADL soil themselves. And that makes me very happy :)

Posts: 1913 | From: Slipping the surly bonds of earth | Registered: Dec 2004  | Report this post to a Moderator
Archangel1
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I have had no reliability issues using standard mil spec carbine buffers and springs with a mid-length barrel system. No fancy buffers, springs or adjustable gas blocks needed either. Rifle buffers and springs should be different.

I used an Adams rifle gas-length piston upper with a carbine lower without issues as well. Not sure about the piston upper. Shoots really soft but accurate enough. Figured it might work for a small women or teenager who are learning to shoot something more than a 22. No major issues with reliability, although I never put enough rounds down range at one time to determine MTBF.

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"Power tends to corrupt and absolute power corrupts absolutely. Great men are almost always Bad Men." Lord Actin 1887

I fear we live in evil times...

Posts: 727 | From: West | Registered: Feb 2012  | Report this post to a Moderator
JWF
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Do mid length gas tubes interchange between brands or are they proprietary?

[ 07-28-2017, 04:15 AM: Message edited by: JWF ]

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Posts: 43 | From: Oregon | Registered: May 2017  | Report this post to a Moderator
Archangel1
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Coatings aside for some brands, I am not aware of proprietary differences between brands. One end fits into the gas block and one end fits into the BCG's gas key so length and tip design should be consistent. I chose not to use more expensive, specially-coated tubes.

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"Power tends to corrupt and absolute power corrupts absolutely. Great men are almost always Bad Men." Lord Actin 1887

I fear we live in evil times...

Posts: 727 | From: West | Registered: Feb 2012  | Report this post to a Moderator
JWF
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so an h2 buffer for my carbine is diffrent then one that goes in a midlength?

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N/A

Posts: 43 | From: Oregon | Registered: May 2017  | Report this post to a Moderator
D308cat
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I have standard Carbine buffer and buffer tube on both my mid lengths and my government profile 20, with telescoping stocks, all with M-16 carriers, No problems at all !

[ 08-16-2017, 09:33 AM: Message edited by: D308cat ]

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PSALM 144:01 Blessed be the LORD my Rock, Who trains my hands for war, And my fingers for battle---

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Archangel1
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quote:
Originally posted by JWF:
so an h2 buffer for my carbine is diffrent then one that goes in a midlength?

I used standard carbine buffers with my midlength upper with no issue. You will have to test the H2 buffer with your rifle to make sure that it operates with all ammunition.

I primarily buy Lake City 5.56 55 gr. ammo for consistency, but have some 75 and 77 gr. ammo, and some .223 55 gr. ammo around in case a .223-only rifle surfaces(Winchester, Fiocchi and PMC) and none of them have caused issues.

I have never run TULA steel case which is supposedly underpowered, so that would be something to test, and especially to let the upper run dirty.

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"Power tends to corrupt and absolute power corrupts absolutely. Great men are almost always Bad Men." Lord Actin 1887

I fear we live in evil times...

Posts: 727 | From: West | Registered: Feb 2012  | Report this post to a Moderator
Rudy
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The buffer used will depend on the stock, not the barrel.

I have 2 carbines that are piston driven. The select fire one has an H2 buffer. that and the piston have caused the rate of fire to drop from 725 to 650. I much prefer the slower rate.

I took a tactical class for the carbine. At the close ranges of 25 - 35 yards I was always able to keep a 3-round burst on the steel targets must to the amazement of the instructors.

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Rudy out
"Once the pin is pulled, Mr. Handgrenade is no longer our friend."

Posts: 2098 | From: 43BN-37FF | Registered: Feb 2004  | Report this post to a Moderator
   

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