Once postponed until December, the Army dust chamber test, designed to test the M4 carbine's performance against a handful of other carbines, should now be finished by Thanksgiving. Testers at the Army Test and Evaluation Center at Aberdeen Proving Ground, Md., began testing the M4 against the Heckler & Koch 416, the H&K XM8 and FNH USA's Special Operations Forces Combat Assault Rifle on Sept. 24, said Army Col. Carl Lipsit, project manager for Soldier Weapons. The... (GunPolicy.org)