Standard factory replacement part for your Colt LE901 rifle. Conversion kit allows you to convert your .308 Winchester LE901 rifle to accept a standard pattern AR-15 magazine. The kit includes the replacement buffer and spring which will make your lower ready to add the 5.56mm Colt upper on it. Kt is made to Colt specifications and tolerances, to ensure perfect fit and operation. Includes magazine well block, carbine buffer and carbine spring.