The 36" TAN i-SHOT TCC (Tac Carbine Case) case.
Just got it from Grant, and this is a superb case, expensive maybe, but cheap compared to what it carries.
From the sertsystem.com website:
TAC CARBINE CASE
Available in lengths of 36", 42" & 46" - Currently only in BLACK & KHAKI
PALS Webbing both on the insides of the main compartment and the large outside pocket allows you to configure the mount and provides sufficient space for you to attach any of your existing PALS related pouches.
Height - The height of the case is such that you can mount a fully loaded carbine, with optics / NVD and a 30-rounder, ready to go
Length - These cases are produced with about an additional inch or so in length since feedback we received indicated that most cases are too tight a fit.
1000 Denier Cordura
Two Set of External D-Rings allow versatility of strap placement; shoulder carry or quiver carry (rear)
Non-Slip Padded Strap
Heavy Duty Steel Hardware & Webbing
Lockable #10 YKK Zippers
Close Cell Foam with Plastic Inserts - protective padding and the inserts prevent any printing / signature of the carbine