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Posted: 12/19/2015 9:00:16 PM EDT
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Lets talk front site post. It is something I have seen mentioned in a few post on a few different sites that todays front post are not right. Well that leads me to asking why?
Can someone tell me the difference of a modern front site post versus that of a Vietnam era site post? Also can you tell me where I might find the correct site post? While I'm thinking about it. The C7 upper that I have will either be a 723 or 733 clone, I'm guessing a 733 is what I will build, what would be the correct front site post for it? If I'm thinking right they were A2's and would be what is found on modern AR's. It is something that when I started looking for barrels that got me to thinking about the front site post. I didn't know there was a difference until I read a few threads that had made mention of them. I should have the first of my builds starting soon. I'm thinking my first build or first two builds will be a 604 and a 629. The only thing that will not look correct (I hope) for right now will be the lower receivers on all of the builds. I'm going to use the full fence lower's that I have from PSA for these builds until I can get the correct ones. Thanks everyone. |
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How hard are these to find? Are they still being made or is someone reproducing these? Quoted:
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A1 front sight posts have 5 adjustment notches and are round, A2 front sight posts have 4 adjustment notches and are square. How hard are these to find? Are they still being made or is someone reproducing these? pretty easy to find and pretty cheap. there's some for sale in the EE Used Uppers section IIRC. |
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check your IM  Quoted:
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I will check out Brownells. I have not seen them in EE maybe I missed them. I will keep looking. check your IM Thanks, I checked it and the link. I tried to send back a message but your inbox if full. I think what my question is the actual post itself and not the site but now I know the site is different and I will have to keep that in mind. Is the "Post" different from Vietnam area rifles to today's rifles? Is it called A frame site post? |
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Thanks, I checked it and the link. I tried to send back a message but your inbox if full. I think what my question is the actual post itself and not the site but now I know the site is different and I will have to keep that in mind. Is the "Post" different from Vietnam area rifles to today's rifles? Is it called A frame site post? Quoted:
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I will check out Brownells. I have not seen them in EE maybe I missed them. I will keep looking. check your IM Thanks, I checked it and the link. I tried to send back a message but your inbox if full. I think what my question is the actual post itself and not the site but now I know the site is different and I will have to keep that in mind. Is the "Post" different from Vietnam area rifles to today's rifles? Is it called A frame site post? The "A Frame" is the Front Sight Base or FSB. Someone smart will be along shortly to explain the difference between "F Marked" and A1 FSB's. I am not that guy. |
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The "A Frame" is the Front Sight Base or FSB. Someone smart will be along shortly to explain the difference between "F Marked" and A1 FSB's. I am not that guy. Quoted:
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I will check out Brownells. I have not seen them in EE maybe I missed them. I will keep looking. check your IM Thanks, I checked it and the link. I tried to send back a message but your inbox if full. I think what my question is the actual post itself and not the site but now I know the site is different and I will have to keep that in mind. Is the "Post" different from Vietnam area rifles to today's rifles? Is it called A frame site post? The "A Frame" is the Front Sight Base or FSB. Someone smart will be along shortly to explain the difference between "F Marked" and A1 FSB's. I am not that guy. Thank you. I didn't know the correct term of what I was looking for. |
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so the front sight base of a vietnam era was fitted for a .625" profile barrel. most modern barrels today are of the A2 diameter of .750"
a front sight base may have a different height and those are "usually" marked with a F stamp. those are for carbine barrels on a flattop upper. you can find current production .625" front sight bases. not sure if you're concerned with how they were marked but there are a variety of forge codes. |
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so the front sight base of a vietnam era was fitted for a .625" profile barrel. most modern barrels today are of the A2 diameter of .750" a front sight base may have a different height and those are "usually" marked with a F stamp. those are for carbine barrels on a flattop upper. you can find current production .625" front sight bases. not sure if you're concerned with how they were marked but there are a variety of forge codes. I'm learning that there are a few different forge codes. Where do I find the correct front site base? I found some on Brownells just not sure if they are correct. I used the search and key world AR-15 A1. |
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Where do I find the correct front site base? I found some on Brownells just not sure if they are correct.
Forge codes will be different on current production .625 pieces such as Brownell's than the original Colts but really about the only difference. Generally easier to install an undrilled FSB than previously drilled unit but shouldn't be a problem for one who knows what they are doing and has the proper equipment. C and Bell code will probably be the most mass produced for Colt M-16A1 barrels for true VN era pieces and production of these continued post VN. Probably easiest to find in auction setting such as GB, e-bay or such. Couple of members probably have some to sell but not sure about CoC for recommendation. Appears you are on the right track. I've observed at least 4 different forge codes on the FSB's on Colt M-16A1 and I'm sure there were more but they seemed to be the most prevalent. Check Elkies Colt guide for pics and fairly accurate timeline for VN era M-16 parts production. |
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Where do I find the correct front site base? I found some on Brownells just not sure if they are correct. Forge codes will be different on current production .625 pieces such as Brownell's than the original Colts but really about the only difference. Generally easier to install an undrilled FSB than previously drilled unit but shouldn't be a problem for one who knows what they are doing and has the proper equipment. C and Bell code will probably be the most mass produced for Colt M-16A1 barrels for true VN era pieces and production of these continued post VN. Probably easiest to find in auction setting such as GB, e-bay or such. Couple of members probably have some to sell but not sure about CoC for recommendation. Appears you are on the right track. I've observed at least 4 different forge codes on the FSB's on Colt M-16A1 and I'm sure there were more but they seemed to be the most prevalent. Check Elkies Colt guide for pics and fairly accurate timeline for VN era M-16 parts production. Thanks I will do that. I talked with Boywonder and I think he has what I'm looking. I just have to wait until after Christmas to be able to afford my next round of parts buying. I thought about doing at least 3-4 rifles at one time but I might do two at a time. But I might not. The retro bug has its teeth sunk in really good right about now lol. I keep asking myself how many retro AR's do I need? My answer how can I ask such a thing. I would like to do at least three 20" barrel rifles. I wouldn't mind two 16" rifles if I don't end up doing SBR's. I'm still learning and there is a lot to learn. |
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