Granted Patent B2

US 7,131,228 · App. 11/154,738 · Granted Nov 7, 2006

Abstract

Claims (6)

1. A modular automatic or semi automatic firearm comprising:

an upper receiver assembly having a bolt, a barrel and venting features for allowing cooling air to pass there through;

a lower receiver assembly connected to the upper receiver assembly and having a fire control assembly; and

a magazine well connected to the upper receiver assembly and adapted to accept a magazine of cartridges;

wherein, the lower receiver assembly and the magazine well are removably and interlockingly secured to the upper receiver assembly, wherein the magazine well and the barrel are selectable from different interchangeable magazine wells and different interchangeable barrels each having a different predetermined characteristic, and wherein, the lower receiver assembly and the magazine well are removable from the upper receiver assembly without tools and without removal of fasteners.

2. The firearm in claim 1 , wherein the firearm is an M-4 firearm.

Assignments (25)