Forum Thread

AR15 question

dealgate 6,368 1,085 January 28, 2016 at 04:00 PM
My A2 gas block/front sight is in front of my scope so I want to replace it with a low profile block with a picatinny rail and a flip-up sight. I think I need to drive the A2 block off with a punch and install the new block the same way. I've never done this before anyone do this? Also anyone can recommend a gas block? I was thinking of the Magpul sight but not familiar with gas blocks.

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#2
you may want to post your question here : https://www.ar15.com/forums/
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#3
Youtube is a wonderful resource for anything How to. I would suggest looking there to maybe become familiar with the process.
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#4
Thanks! I checked out a bunch of AR15 build videos and now I want to do more to it like add a free float rail system and stuff. It looks like the biggest PITA is removing the stock A2 gas block but once that is off, future mods are easier.
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#5
Quote from dealgate View Post :
My A2 gas block/front sight is in front of my scope so I want to replace it with a low profile block with a picatinny rail and a flip-up sight. I think I need to drive the A2 block off with a punch and install the new block the same way. I've never done this before anyone do this? Also anyone can recommend a gas block? I was thinking of the Magpul sight but not familiar with gas blocks.
You just put the barrel in a bench vise, then you take a large ball peen hammer and a 3/4" cold chisel and you just pound that farker as hard as you can. It'll come right off.

Oh, I forgot to remind you to unload the gun first. That's really important.
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Last edited by Rebound February 1, 2016 at 06:24 PM
#6
Or you could invest $10.00 to $20.00 to pay an armorer to do it for you.
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#7
Quote from dale_101798 View Post :
Or you could invest $10.00 to $20.00 to pay an armorer to do it for you.
Or, I could explain the blow torch method instead, if you want.
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#8
Quote from Rebound View Post :
Or, I could explain the blow torch method instead, if you want.
Naw the blow torch would probably burn up the bearings and you fingers if you don't know what your doing.

Of course on the other hand dry ice could help by shrinking the barrel just a tad.
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#9
Quote from Rebound View Post :
You just put the barrel in a bench vise, then you take a large ball peen hammer and a 3/4" cold chisel and you just pound that farker as hard as you can. It'll come right off.

Oh, I forgot to remind you to unload the gun first. That's really important.
This is what they did in the videos I watched. Ball peen hammer and steel punch. Now I know why my armorer set came with some steel punches. My cheaper (PSA upper) AR has the tapered pins with enough exposed to drive them out with some wacks from a hammer but the RRA AR they are a much tighter fit with no exposed area to beat on. Since that is the one I want to modify I am going to have to use just the punch. We'll see how it works out. Hopefully I don't bugger it up too bad. Nothing with the old sight will be saved so I don't care much about what condition it ends up in. I guess I could just dremel it out if it came to that. I might just replace the barrel anyway I'll decide later when it is disassembled.

Also I really want to do this all myself. Nothing like learning valuable life skills. I "built" this AR anyway from a stripped lower but I got the upper assembled. So this is a good learning opportunity. I have plenty of other ARs if the zombies happen to attack while I am in the middle of this process.
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#10
Quote from dealgate View Post :
My A2 gas block/front sight is in front of my scope so I want to replace it with a low profile block with a picatinny rail and a flip-up sight. I think I need to drive the A2 block off with a punch and install the new block the same way. I've never done this before anyone do this? Also anyone can recommend a gas block? I was thinking of the Magpul sight but not familiar with gas blocks.
people have already commented that youtube is a great resource for stuff like this, I actually did the same thing a couple years ago, I used a youtube video as a tutorial but unfortunately I can't find the exact one I used.

I didn't have the all "proper" tools such a vise block or delta ring wrench but i was able to remove my front sight post with a punch I got from home depot, removed my handguard using long handled channel locks (if you can't remove yours by hand) & since I wasn't gonna used the delta ring again I cut it off with my dremel.

You can get a nice gas block from Aimsurplus, PrimaryArms or Amazon. And if you plan on buying the polymer Magpul flip up sights (like I did) the installation instructions say to not install it over the gas block.
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#11
Quote from dealgate View Post :
I have plenty of other ARs if the zombies happen to attack while I am in the middle of this process.
Plus you'll have a hammer and a blowtorch in your hands.
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