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Discussion Starter · #1 ·
So I'm going to put a Troy battle rail on a Bushmaster AR10, and I have ran into a snag. On the gasblock the "pins" are actually rivets so a punch will not work right off the bat. So I used a buzzed the heads off of the rivets on the left side of the block, they still won't punch out.

I'm at a loss here.. Anyone else had this problem??
 

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Discussion Starter · #3 ·
mountainman13 said:
Have you applied heat to the gas block?
Yes, I figured that's what it needed. Didn't work...
This is so frustrating! I've never had this problem before.
 

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kryptar19 said:
So I'm going to put a Troy battle rail on a Bushmaster AR10, and I have ran into a snag. On the gasblock the "pins" are actually rivets so a punch will not work right off the bat. So I used a buzzed the heads off of the rivets on the left side of the block, they still won't punch out.

I'm at a loss here.. Anyone else had this problem??
I'm about to do the same thing for a friend here in an hour, I let you know how it goes.
 

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kryptar19 said:
So I'm going to put a Troy battle rail on a Bushmaster AR10, and I have ran into a snag. On the gasblock the "pins" are actually rivets so a punch will not work right off the bat. So I used a buzzed the heads off of the rivets on the left side of the block, they still won't punch out.

I'm at a loss here.. Anyone else had this problem??
I just did my friends and I got lucky they punched right out. I grinded them down flat to the same level as the sight base, and got the right size punch, and it worked. Did not put a nick on the barrel.
 

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I rune in to the issue when I work on cars and some times I have to drill them out I don't know if you can do that on a ar but just my .02 cents
 

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Discussion Starter · #13 ·
Sgt_Skrb_25 said:
I just did my friends and I got lucky they punched right out. I grinded them down flat to the same level as the sight base, and got the right size punch, and it worked. Did not put a nick on the barrel.
You grind em off on both sides??
 

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Do you know anyone with a hydraulic press?
 

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kryptar19 said:
You grind em off on both sides??
I just grinded of one side and I can barely make out where the stem of the rivet was. I used a punch half the diameter of the rivet head, hoping it would fit. I got lucky and it popped out. I have never broken down a front sight base like that, I can't believe they drill out the barrel for the rivets. That's why I think they are garbage. I have only built with free float quad rails and rail mounted sights. Can you even make out where the grinded of stems are?
 

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Discussion Starter · #16 ·
Sgt_Skrb_25 said:
I just grinded of one side and I can barely make out where the stem of the rivet was. I used a punch half the diameter of the rivet head, hoping it would fit. I got lucky and it popped out. I have never broken down a front sight base like that, I can't believe they drill out the barrel for the rivets. That's why I think they are garbage. I have only built with free float quad rails and rail mounted sights. Can you even make out where the grinded of stems are?
No. It's the damnedest thing. I even tried a titanium bit on a high speed dremel and it would just spin on the dimple I made, didn't even bite into it.

I'm at a complete loss for what to do...
 

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this is gonna sound stupid...

Have you tried using any liquid wrench or WD40?
 

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You really need a hydraulic or pneumatic press, but since you don't have access to one... If you are going to try to drill them out, you could try a diamond coated, glass and tile bit.
 

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I couldn't change out the gas block on my Bushmaster AR-15 for the same reason. I took it to a gunsmith and he couldn't do it without a press. He said the barrel was coated after the block was installed and that coating is super strong. You have to break the seal of that coating around the rivet and it takes a lot of pressure to do it. I think it is manganese phosphate.
 
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