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11/19/2015 2:00:48 AM EDT
I'm confused. I'm building my first AR (MK12) and have a question.

I'm wanting to run a 15 inch rail, most of which are classified as Gas System Length: "extended rifle".

I'm not finding any extended rifle length barrels though?

Will a RIFLE LENGTH gas system/barrel work with EXTENDED RIFLE LENGTH rail? So confused as to how these things correspond.

- Cap
11/19/2015 3:24:48 AM EDT
[#1]
Quoted:
I'm confused. I'm building my first AR (MK12) and have a question.

I'm wanting to run a 15 inch rail, most of which are classified as Gas System Length: "extended rifle".

I'm not finding any extended rifle length barrels though?

Will a RIFLE LENGTH gas system/barrel work with EXTENDED RIFLE LENGTH rail? So confused as to how these things correspond.

- Cap
View Quote

Yes, as long as you use a low profile gas block.
11/19/2015 4:44:56 AM EDT
[#2]
Rifle length rail system is designed to fit in between the receiver and a Front Sight Base -FSB on a rifle based gas system if the rifle is so equipped.

Rifle length I think is 12 inches
Mid length 9 inches
Carbine length 7 inches
Pistol is 4 inches

A "Extended Rifle"  rail is just stating it is longer and will require a Low Profile Gas Block because it wouldn't fit in between the receiver and the FSB if it has one.

AR Sponsor