16 inch with rifle gas?

[twofocused]

So thanks to USMC6094 I’m madly in love with the a1 upper, a fsb, and the dissipator look.

I found a 16 inch barreled rifle gas setup on Brownells but, I have a few questions.

1. How will a 16 inch with rifle gas operate? Reliable?

2. Can I run a carbine buffer tube with a heavier buffer to slow dwell time? If so which weight?

3. Should I just buy a carbine gas dissipator upper so I can run a simple carbine buffer and know it will be reliable?

This may be elementary for some but, I’m still learning a ton on here. I’ve had a 10.5 pistol for years that I love but, recently have been bit by the ar bug.

Thanks

 

[Beef15]

@JBoyette didn't you mess around with a lot of "long" for barrel gas systems?

I imagine, the port is sized appropriately or errs large in what you're looking at. Carbine length buffer and extension should be fine, weight may require tuning. Chance it'll be a little ammo sensitive. Probably be smooth/flat cycling though.

 

[JBoyette]

Yes I did and yes they work just fine.

The profile of the barrel for stiffness is needed, so no lightweight profiles, think medium contour +.

You will need to do two things no one thinks about.

First, the gas port on the gas block will need to be opened up to be equal to the IS of the gas tube's ID. The port on the barrel can be any size you want, but if the gas blocks port restricts the flow.... Or go adjustable. If running a FSP, look for CMP adjustable gas, not windage FSP. Or call Compass Lake Engineering, when talking to one of Franks kids or wife, be respectful, they know more about the AR platform than all of us combined.....

Second, if you have a lock back issue, remove the pin in the buffer and remove all weights and replace the nylon end cap and pin.

John

 

[twofocused]

Thanks John

 

[jimmyheadgear]

I have a 16" rifle gas setup. It has become my favorite full size AR.

I bought the barrel from Special Ops Tactical. I didn't have to change anything to get it to run. I can't tell you how good it works with weak and crappy ammo though. I use regular bronze cased .556. 55 and 62 grain with no problems. It's a real smooth shooter.

Here's a link.
https://www.ar15news.com/2017/07/19/siphon-agp-angled-gas-port-nitride-barrels-special-ops-tactical/

 

[NKD]

Criterian also makes a 16" rifle gas.
JP makes an adjustable gas front sight post that is very nice.

As has been mentioned, likely you are going to need to go lighter weight on buffer and/or spring rather than heavier. Heavier is usually a bandaid for over gassed guns, which is very common with carbine length gas, which has much higher pressure than rifle length gas.