[ARCHIVED THREAD] - Cast vs forged

Posted: 5/12/2017 8:20:01 PM EDT

How do you tell the difference between a cast FSB and a forged one that has had the flashing removed?

Posted: 5/12/2017 8:26:12 PM EDT

[#1]

Quoted:
How do you tell the difference between a cast FSB and a forged one that has had the flashing removed?

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Surface finish.

Posted: 5/12/2017 8:44:46 PM EDT

[#2]

Quoted:
How do you tell the difference between a cast FSB and a forged one that has had the flashing removed?

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It'll be obvious when you figure it all out.

http://www.ar15.com/forums/t_3_123/241681_0Colt_s_USGI_M16_series_variation_guide_edition_IV.html

^^^About 1/3d of the way down on page one are some good pics. Cast has raised "UP <-" verses engraved "UP <-" on the forged FSB. Cast has a smoother finish and crisp sharp edges.

Posted: 5/12/2017 8:51:19 PM EDT

[#3]

Forged on left, cast on right.

Cast: Flat rear vertical, raised "UP"

Forged: Round rear vertical, stamped "UP"

Posted: 5/12/2017 10:14:35 PM EDT

[#4]

Yeah, it's usually the sharp edges/ clean lines that give away a cast fsb. That and the previously mentioned difference between the "up" on the two.

Posted: 5/13/2017 3:15:46 AM EDT

[#5]

A cast FSB will have a paper-thin "casting line" right down the center of the part. A forged FSB will either be ground smooth, or have a much wider "forging line" down its center.

[ARCHIVED THREAD] - Cast vs forged

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[ARCHIVED THREAD] - Cast vs forged

[ARCHIVED THREAD] - Cast vs forged