AR15.Com Archives
 how to remove front sight on colt m4?
lrush  [Member]
8/20/2008 5:56:39 PM EST
I am trying to replace the handguard and need to remove the front sight tower but cannot get the pins to budge. Am I missing something??
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GhostRing  [Team Member]
8/20/2008 6:01:46 PM EST
Are you hitting them in the correct direction?
Are you using the correct tools?
Are you hitting them hard enough? (might be harder than you think)
Are you properly supporting the barrel/FSB?

You post lacks significant info.
lrush  [Member]
8/20/2008 6:07:26 PM EST
I am trying to remove them from the right side of the barrel. I am hitting them pretty hard. I have steel an brass punches and a smal tool hammer.
GhostRing  [Team Member]
8/20/2008 6:09:47 PM EST
Are you going tap, tap, tap...or WHACK.

Guess which one works.


Bigger hammer is likely in order.
ftwm  [Team Member]
8/20/2008 6:35:07 PM EST
Where did you get a Colt M4 ???
lrush  [Member]
8/20/2008 6:35:40 PM EST
so I have broken 3 steel punches with the whack method. The front pin is out but the rear is not moving.
lrush  [Member]
8/20/2008 6:36:40 PM EST

Originally Posted By ftwm:
Where did you get a Colt M4 ???


does it make a difference to the pin removal??
ftwm  [Team Member]
8/20/2008 6:40:05 PM EST
Is it really that hard to answer? I'd just like to know why a guy with a machine gun can't figure out how to remove his FSB.
lrush  [Member]
8/20/2008 6:49:53 PM EST
bought it at a yard sale...really does it matter. I am having difficulty it is not normal this rear pin. Thanks for your help.
ftwm  [Team Member]
8/20/2008 6:57:25 PM EST
Well, I had the same issue on my 6920 and I was going to suggest something that worked for me. But you are obviously too cool to answer a simple question without copping an attitude so have fun breaking punches.
ar_mcadams  [Team Member]
8/20/2008 7:45:32 PM EST
its a shame to whack on a 6920.
GhostRing  [Team Member]
8/20/2008 8:08:23 PM EST

Originally Posted By ar_mcadams:
its a shame to whack on a 6920.


Why?

It's just a production AR...not a priceless relic.
gorvibub  [Member]
8/20/2008 8:56:45 PM EST

Originally Posted By ftwm:
Well, I had the same issue on my 6920 and I was going to suggest something that worked for me. But you are obviously too cool to answer a simple question without copping an attitude so have fun breaking punches.


based on his post count he probably does not have the amount of experience some on this board do. he most likely has a 6920 and used the generic definition of M4 (i think you knew that) and does not own a "machine gun". your question had nothing to do with helping him and most likely was just an attempt by you to point out that he did not own a real M4.

even if he has a real M4 why would that mean that he automatically has to know how to work on it. lots of people own items they don't know haw to repair on their own. you are apparently "too cool" to help someone out with out demanding something in return. if you have a fix for his problem than just say what it is.
platypusREX  [Member]
8/20/2008 8:59:18 PM EST

Originally Posted By ftwm:
Is it really that hard to answer? I'd just like to know why a guy with a machine gun can't figure out how to remove his FSB.

You are trying to be a jargon a$$. Maybe he has a MT6400C. That is a M4, why? Because it says it on the side.
lrush  [Member]
8/21/2008 4:03:09 AM EST

Originally Posted By gorvibub:

Originally Posted By ftwm:
Well, I had the same issue on my 6920 and I was going to suggest something that worked for me. But you are obviously too cool to answer a simple question without copping an attitude so have fun breaking punches.


based on his post count he probably does not have the amount of experience some on this board do. he most likely has a 6920 and used the generic definition of M4 (i think you knew that) and does not own a "machine gun". your question had nothing to do with helping him and most likely was just an attempt by you to point out that he did not own a real M4.

even if he has a real M4 why would that mean that he automatically has to know how to work on it. lots of people own items they don't know haw to repair on their own. you are apparently "too cool" to help someone out with out demanding something in return. if you have a fix for his problem than just say what it is.



Thanks

Yes, it is a 6920. I am more than happy to answer questions that relate to helping me with my issue. If where I purchased it makes a difference on how to remove it then I apologize as I did not see the relavence.

Now back to the matter at hand. The front pin is out and the rear is not budging. Any thoughts?
gorvibub  [Member]
8/21/2008 11:05:16 AM EST
i have never done this but i have read of people putting parts in the freezer or using heat to get parts that a stuck together to come loose easier. i was thinking you could put the upper in the freezer to get the pin to shrink slightly then heat the gas block to get it to expand a little. this might help but i have never tried it myself. hopefully someone with more experience with this will chime in.
vellnueve  [Member]
8/21/2008 11:24:28 AM EST
Drill it out, and then install a new pin when reinstalling it.
gorvibub  [Member]
8/21/2008 11:31:01 AM EST

Originally Posted By vellnueve:
Drill it out, and then install a new pin when reinstalling it.


i would not go this rout. way more chance of screwing things up.
COZ_45  [Team Member]
8/21/2008 11:38:12 AM EST

Originally Posted By ar_mcadams:
its a shame to whack on a 6920.


NEVER watch anyone work on your AR. When I was doing gun shows I would install free float tubes, low pro blocks, handguards etc. I would do it at the table with a portable vise I had set up. I would ask the customer to go tour the gun show. Inevitably he would see me swinging my big ball peen into a big blue steel punch to get the sight pins out and

It's just scary to watch.

Knock the shit out of them and make sure you've positioned the punch on them and not on the block. I often used a finishing nail punch to get them started moving. It's smaller than the pin and tapered and hard as hell

Edited to add. Have a stable bench under it. Use a front sight block if you can and support the other end of the barrel or upper at the same height or thereabouts so you're driving straight down on the pin.
GONIF  [Member]
8/21/2008 12:54:22 PM EST
spray it with Kroil and give it a couple hours to work,than try again,look at the one you took out and see if it is tapered or straight. if tapered remove from the small end. you will most likely need new pins if you bugger them up takeing them out .
gorvibub  [Member]
8/21/2008 3:28:28 PM EST

Originally Posted By GONIF:
spray it with Kroil and give it a couple hours to work,than try again,look at the one you took out and see if it is tapered or straight. if tapered remove from the small end. you will most likely need new pins if you bugger them up takeing them out .


this is also a good idea to try.
lrush  [Member]
8/22/2008 4:09:32 AM EST
Thanks for all the responses. I was able to get the rear pin out finally with a different punch. The new reail Larue 12.0 looks awesome!
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