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Posted: 6/9/2018 3:11:21 PM EDT
[#1]
Most retro models do not use the cast fsb, just the 601,602 and early xm16e1. Finding a real Colt cast fsb is rare and expensive, a lot of guys use Olympic Arms cast fsbs which are easier to find and a lot cheaper. What model are you building?
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Posted: 6/9/2018 3:24:23 PM EDT
[#2]
Still waffling on the model. Where can I learn (description andor pics) about the Olympic vs Colt (assumption that original is Colt)?
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Posted: 6/9/2018 7:06:23 PM EDT
[#3]
Quote HistoryQuoted:
Most retro models do not use the cast fsb, just the 601,602 and early xm16e1. Finding a real Colt cast fsb is rare and expensive, a lot of guys use Olympic Arms cast fsbs which are easier to find and a lot cheaper. What model are you building? |
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Posted: 6/9/2018 7:14:39 PM EDT
[#4]
Quote HistoryQuoted:
Still waffling on the model. Where can I learn (description andor pics) about the Olympic vs Colt (assumption that original is Colt)? |
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Posted: 6/10/2018 11:43:19 AM EDT
[#5]
Quote HistoryQuoted:
Early Air Force 604's also had cast front sights Quote HistoryQuoted:
Quoted:
Most retro models do not use the cast fsb, just the 601,602 and early xm16e1. Finding a real Colt cast fsb is rare and expensive, a lot of guys use Olympic Arms cast fsbs which are easier to find and a lot cheaper. What model are you building? OP - I've been thinking about the Brownells cast fsb but maybe have JT clean up the flash marks and drill it because they dont have the taper pin holes, so that might be a way to go as well? The forged one would just move over to the GM barrel that arrives tomorrow.... |
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Posted: 6/10/2018 5:29:20 PM EDT
[#6]
Quote HistoryQuoted:
The only ones that I saw were 601s which by serial number indicated they were from the original purchase. Some had black furniture but basically they were refugees from the massive post-Vietnam Anniston depot rebuild in the early 70s. Rebuilt weapons had ANAD with two digit Month/Year stamped on the side of the lower receiver mag well. OP - I've been thinking about the Brownells cast fsb but maybe have JT clean up the flash marks and drill it because they dont have the taper pin holes, so that might be a way to go as well? The forged one would just move over to the GM barrel that arrives tomorrow.... |
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Posted: 6/11/2018 9:35:40 AM EDT
[#7]
Quote HistoryQuoted:
Most retro models do not use the cast fsb, just the 601,602 and early xm16e1. Finding a real Colt cast fsb is rare and expensive, a lot of guys use Olympic Arms cast fsbs which are easier to find and a lot cheaper. What model are you building? |
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Posted: 7/16/2018 9:06:24 PM EDT
[#8]
Thank you all for the info. Still struggling along collecting parts.... More to go....
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Posted: 7/17/2018 6:22:07 AM EDT
[#9]
Quote HistoryQuoted:
A cast front sight is not correct on any XM16E1, unless you are copying one of the first hand built prototypes. One of the many military specifications for acceptance of the XM16E1 was that the front sight was to be changed from the early cast variety to the type still in use today. However, PRODUCTION (not just rebuilt) 604's left the factory with the early cast front sights. Quote HistoryQuoted:
Quoted:
Most retro models do not use the cast fsb, just the 601,602 and early xm16e1. Finding a real Colt cast fsb is rare and expensive, a lot of guys use Olympic Arms cast fsbs which are easier to find and a lot cheaper. What model are you building? 
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Posted: 7/17/2018 1:34:19 PM EDT
[#10]
Quote HistoryQuoted: Correct with the very early 604's. Here is my very early 604 upper with M VP 12 barrel and cast FSB. https://i.imgur.com/Wlyxh3S.jpg ' |
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Posted: 7/17/2018 6:33:09 PM EDT
[#11]
Quote HistoryQuoted:
thats a whole lot of "wow" ' Quote HistoryQuoted:
Quoted: Correct with the very early 604's. Here is my very early 604 upper with M VP 12 barrel and cast FSB. https://i.imgur.com/Wlyxh3S.jpg ' 
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