Ar15 front sight post removal.

Discussion in 'AR-15 Discussion' started by rurak, Aug 17, 2012.

  1. rurak

    rurak New Member

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    Hey all. I've got an m&p 15 sport. I'm toying with the idea of removing the front sight post which is also the gas block. I know it's difficult but I really just want to see it done. I can't find any videos on it. Can anyone post a video or pics or a write up please.? I would like to put a flip up front sight instead of a fixed post.
     
  2. JonM

    JonM Moderator

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    any reason why?? the fixed fsb is much more sturdy and almost impossible to dislodge with damage that would bend the barrel. on some SW they stupidly put the taper pins opposite of how it is supposed to be done. you really have to look and see which side is larger than the other. the pins have to be driven out from the small side

    [ame]http://www.youtube.com/watch?v=uS0J3pRcNus[/ame]
     
    Last edited: Aug 17, 2012

  3. okdonk

    okdonk New Member

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    I just searched "front sight post removal" in youtube. It shows a few videos. Check them out. And good luck.
    Also, i assume you will be replacing the original plastic handguard with a quad rail? What rail do you have in mind?
     
  4. rurak

    rurak New Member

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    Ive already got a quad rail on it. Im actually just curious about how its removed and how difficult it is. Judging by what ive read i wont attempt it myself. I want to take it off because ive got a scope on it and you can see the post through the scope if you look at the right angle
     
  5. Gatoragn

    Gatoragn Active Member

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    On the vast majority of ARs, lay the barrel with the right side down, back the pins out left to right. Use a pin punch slightly larger than the pins and give them a firm whack to start them. A smaller diameter pin or a center punch runs the risk of bradding the ends.

    According to a 'smith I trust, Bushmaster is one of the exceptions, they back out from right to left.
     
  6. rurak

    rurak New Member

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    Thank you for your help
     
  7. ZeusEcho

    ZeusEcho Member Lifetime Supporter

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    Rurak- some of the tools may also cost you more than just having someone else remove it. Don't buy that piece of Sh*t Brownells block, it does not support the FSB correctly because it's machined flat and allows the FSB/Barrel to rotate when hit. I tried everything mentioned online and bought the correct tools and still couldn't remove the FSB on my BCM. I sent it to Steve at ADCO and they removed it for $35. Not only that Steve had it done and shipped back out the same day he received my upper.
     
    Last edited: Aug 20, 2012
  8. purehavoc

    purehavoc New Member

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    I removed them on one of my guns and let me tell u this was not a easy task. I ruined a $20 set of
    Punches. Bought a better hardened set and finally got them off. By the time I spent $50 on punches and built my own block to hold it all l could have sent it to adco . Just saying :D
     
    Last edited: Aug 19, 2012
  9. rurak

    rurak New Member

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    We have a pretty good gunsmith at our lgs that works on ar's. I'm still toying with the idea
     
  10. quadrail74

    quadrail74 New Member

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    Great info in this thread...I'm looking to purchase my first AR and I too, prefer flip up sights. I have a mossberg tactical .22 plinker, and if it wasn't for the carry handle, the fixed front sight would be in the scopes view.
     
  11. Gatoragn

    Gatoragn Active Member

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    I acquired the tactical plinker with removable sights.
     
  12. quadrail74

    quadrail74 New Member

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    Yea the mossberg is a "AR" style rifle, without being and actual AR, but it served a purpose as my first gun purchase. Now I'm looking to get into a serious AR.
     
  13. Tennessee

    Tennessee New Member

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    I have seen many posts all over the net from people wanting to learn how to remove an AR15 A2 front sight base which is also the gas block. Having an older Colt A2 heavy barrel in need of a barrel nut change I was forced to learn how to do this successfully and thought I would share my experience to help others face this challenge. This is probably the hardest thing I have ever had to deal with on an AR platform. What I did was to first do my research and read every post I could find on the experience of others and try and figure out what the procedure was and also to learn from the mistakes of others. I learned I needed special tools and that it is no easy matter to get this done. So.... what I did was get a 12" 4x4 square piece of wood and a router bit about the size of my barrel dia. and then lay the stripped barrel, gas tube and upper removed, facing left side up, or muzzel to the left, chamber to the right on top of the wood block up to the hand guard retaining piece with the rest of the barrel and chamber end supported by a roll of duck tape of all things, on a concrete floor as a solid base. Then I took a sharpy and outlined the barrel on the wood. Next I took my drill and and the router bit and cut out a bed for the barrel and sight to lay in so it would not rotate when I got to the part about hitting the 2 pins with a hammer etc. I routered out deeper below each of the 2 taper pins so they had room to come out. I had bought a tempered hardened steel 3/32 Starret 800C cup faced punch, like the one Brownells sells and took a 3 lb sledge hammer and gave the first pin a rather heavy wack. It popped lose and you could hear the sound of it when it gave. I HIT IT DAMN HARD. Then I took a regular brass punch and finished driving it out. I did the same thing on the other pin and it gave, and came out also. I did not have to remove the sling loop during this process. I simply rotated it out of the way but I could have also routered a deep hole for it in the wood if I wanted too, but it was fine kind of hanging over the end of the 4x4. Once the pins were out, I sprayed on the WD40 and took a plastic headed hammer and hit the back of the sight post once and it came right off. I did make a few minor abrasion marks near the taper pin holes from the use of the punch - but they were quickly fixed with a cold blue pen. I then changed out the old barrel nut and reversed the procedure to drive the taper pins back in, to re-secure the front sight - this time from the right side of course. If you are putting on a free float tube rig, you would skip this step and install a low profile gas block at this point. I hope this information helps you to remove your A2 front sight, it's not as hard as some say - if you have the right tools and do your home work.
     
    Last edited: Sep 20, 2014
  14. Ibmikey

    Ibmikey Member

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    Removal of the pins in a FSB is "iffy" Some use straight pins and can be removed in either direction others use taper pins and depending on manufacturer may come out left to right or the reverse. Inspect and measure the heads to determine.
     
  15. RickOShay13

    RickOShay13 New Member

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    Check out missbattleborn fsb removal


    Sent from my iPad using Firearms Talk
     
  16. nelsonorway1978

    nelsonorway1978 New Member

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    You may have to drill a hole through the pins so they come out easy. That's what I would do so your not beating the hell out of your upper. Punching them out may case them to mushroom over and then you're really not getting them out
     
  17. fsted2a

    fsted2a Active Member

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