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Posted: 7/18/2016 1:43:51 AM EDT
[#1]
The XM-4's would have the 8/3 elevation markings because they were built with rifle uppers, which came with the 8/3 elevation marked rear sight assemblies. The 6/3 elevation marked rear-sights came about later during the development of the removable carry handles for use with flat-top uppers. Hope this helps.
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Posted: 7/18/2016 1:50:30 AM EDT
[#2]
ok thanks. Iv decide to just make a A2 Carbine as if they made it today. Ill use a new Colt A2 stripped upper receiver. I can't seem to find any assembled used ones in new shape. the only differance between a new M4 will be the A2 Receiver and semi auto.
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Posted: 7/18/2016 12:59:57 PM EDT
[#3]
Excellent.
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Posted: 7/18/2016 4:26:58 PM EDT
[#4]
Quote HistoryQuoted:
ok thanks. Iv decide to just make a A2 Carbine as if they made it today. Ill use a new Colt A2 stripped upper receiver. I can't seem to find any assembled used ones in new shape. the only differance between a new M4 will be the A2 Receiver and semi auto. Don't forget to post pics of your build 
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Posted: 7/18/2016 4:36:53 PM EDT
[#5]
I will. be some time though as most of the Colt parts are back ordered or probably not stocked. Brownells
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Posted: 7/21/2016 9:23:02 AM EDT
[#6]
You will also want to a non-F marked FSB if you want to be anal retentive.
I used the taller F marked FSB with A1 front sight, that came with Daniel Defense 14.5" barrel. Zeroed out to 100, excellent sight picture (actually prefer it to my SP1 carbine… too much sight post exposed). As stated above, 8/3 for fixed handle M4s. |
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Posted: 7/21/2016 10:01:54 AM EDT
[#7]
i already have a 6/3. will that not work?
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Posted: 7/21/2016 10:25:50 AM EDT
[#8]
Quote HistoryQuoted:
i already have a 6/3. will that not work? The 6/3 is for detachable handle rear sights. Someone correct me if I'm wrong since I don't have either 6/3 or 8/3 parts in front of me at the moment, but I believe the 8/3 stem is a little longer. Putting a 6/3 in a A2 receiver may fit, but you're just shorting yourself of rear sight adjustment. |
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Posted: 7/21/2016 10:51:07 AM EDT
[#9]
the base threads on the 6/3 and finer than the threads on the 8/3. The 14.5" barrel is only good out to 600m anyway. the pictures look the same height so both should fit
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Posted: 7/21/2016 10:57:28 AM EDT
[#10]
and another $150 to buy the 8/3 sight
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Posted: 7/22/2016 2:27:13 AM EDT
[#11]
I decided that since all the Colt A2 carbines had 8/3 ill go with it.
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