Colt 601 Build

[Sapper740]

Jim,
Out of curiosity what is "Fibrite"...? it's not fiberglass - the examples I see of some originals it looks like molded "Masonite". (My handguards appeared to be fiberglass after sanding them down a bit.)

My understanding, and this is decades old is that fibrite was made from a long fiber polymer. Colt was experimenting with various materials for the M16's furniture and experimented with acetate covered aluminum as found in the CAR 15 telescopic stock and Bakelite in the pistol grip. Fibrite wasn't as strong as required and was eventually replaced by foam filled nylon. There's lots of good info here: Variations in Early AR-15/M16 Rifle Buttstocks - Armament Research Services (ARES)

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[browningautorifle]

a long fiber polymer.

That would follow what I remember from the looks of it. Mine weren't shredded or broken so I had no exposure to it's makings. Those acetate covered aluminum butts were also what we started with on the C8 carbines. Although I started off liking them, once I carried the polymer models a bit the weight was evident.