11.5" Carbine vs. 12.5" Mid-length Unsuppressed

[titsonritz]

I'm trying to make up my mind which setup to go with. Assuming equal quality components and running primarily unsuppressed which would you go with and why?

[JediGuy]

It seems like the 12.5” is not as developed a system. People used to say that about 14.5” midlength, too, of course.

I’m curious about BRT’s possibly EXC for a 12.5” barrel.

[docsherm]

I'm trying to make up my mind which setup to go with. Assuming equal quality components and running primarily unsuppressed which would you go with and why?

12.5 any day.

[mack7.62]

12.5 carbine gas. IIRC from Colt M4 testing the optimal barrel length for carbine gas was 13", the reason for going 14.5 was for bayonet mounting.

[Five_Point_Five_Six]

I voted 11.5" carbine gas because that's what I have experience with. I've never owned a 12.5" mid length.

I have an over gassed 16" PSA mid length CHF barrel that is just sitting in a box, I'm thinking of chopping it to 12.5" and seeing if it will still run reliably with that blown out PSA gas port.

[everready73]

Why not 12.5 carbine length? I would go with 11.5 between the 2 options you listed because I know it works. A 12.5 carbine will run well too

I haven't done any shooting with a 12.5 middy but mostly what I read is it is usually in a suppressed set up.

Centurion now offers a 12.5 middy and that would be the first place I looked. Not sure about port sizing etc, but BRT would probably have that figured out of they offer that configuration

[titsonritz]

Why not 12.5 carbine length? I would go with 11.5 between the 2 options you listed because I know it works. A 12.5 carbine will run well too

I haven't done any shooting with a 12.5 middy but mostly what I read is it is usually in a suppressed set up.

Centurion now offers a 12.5 middy and that would be the first place I looked. Not sure about port sizing etc, but BRT would probably have that figured out of they offer that configuration

You've nailed my dilemma. I've had a BCM Kino and that may up being it again. The Centurion middy is the barrel I'm looking at.

[RVTMaverick]

I know you didn't ask about this length but, 13.7>>>-------> https://www.youtube.com/watch?v=GZxC07B2jYY

I'm trying to make up my mind which setup to go with. Assuming equal quality components and running primarily unsuppressed which would you go with and why?

[RVTMaverick]

OOPS! OH Well

I know you didn't ask about this length but, 13.7>>>-------> https://www.youtube.com/watch?v=GZxC07B2jYY

PLUS>> https://www.youtube.com/watch?v=x5f8AUQBaXI

[jerrysimons]

I would not go 12.5” mid unless I was going to run primary suppressed. 11.5” carbine gas is a good gas system length to barrel length ratio prioritizing less overall length, especially if shooting primarily unsuppressed. 11.5 carbine mainly unsuppressed port size should be about 0.070-0.073”