"MRR" which one?

[Bolivar]

The carbine gas system on the 18" is what would stop me from buying that model.

Good point. Thanks for reminding me. Cool, now I don't to save up for the 18" model.

 

[TheGr8One]

This.

And a change in design would need to be driven by the customer. If there is a requirement for a mid length or rifle length system, and the $$$ is big enough, it will get done. So far there hasn't been a need to change the system if the customer is purchasing the carbine system as is.

I have shot both a Knights and CC with the same barrel length and the recoil is significantly different between the two. Not even close really, the Knights is soft as butter.

Yes you can make any gas tube length work, you just need to plug the variables into the fluid mechanics formulae

But mid length and rifle length gas system will always take longer time to pressurize the system and initiate the extracting cycle. The peak pressure at the gas port will always be lower. You are tapping the gas at a higher velocity with a carbine system, and gives its a shorter path to travel. There is no reason to do that other than cost saving from standardization.

The advantage of using one gas system is obvious- you only need one jig to install gas blocks for all barrel lengths and one gas tube to stock.

 

[bongoz]

Probably an 11.6" MRR down the road for me.

I really like the looks of the 18" MRR and I'm completely sure it's very reliable as Colt Canada makes some of the best AR15s in the world. But I'd prefer a rifle length gas system which would be preferred if I shoot a bit of 3 gun with it.