Front trunion tool in OC

[Swampcrip]

I was wondering if anyone has a front trunion tool i could borrow in OC?

Or if someone can walk me through a non $250 way to replace my ftont trunion. Im close to just buying one of the tools but figured i would ask here first.

Thanks to any advise.

[Oldmandan]

use a bolt cutter and these crimper jaws

http://www.calguns.net/calgunforum/showthread.php?t=756909

[V8MERC124]

The bolt cutter system works pretty well. I did a vid series on using it. Its on the Youtubes under my same handle here.

Btw why do you need to replace (or do you mean re-rivet) your trunnion? You almost never need to do that unless something catastrophic happened.

[God Bless America]

Removing the front trunnion without damaging the receiver will be the problem.

What happened?

[bigbob76]

Removing the front trunnion without damaging the receiver will be the problem.

What happened?

Why is that a problem? There is more to it though, like pulling the barrel so you can redo the rivets.

[God Bless America]

The swell neck rivets mean that the receiver has to be bent open a fair bit to remove the trunnion. A receiver with rails and center support intact won't be easy to bend open far enough without damage.

The swell neck rivets are at the bottom, meaning the receiver has to bend open quite a bit.

[ar15barrels]

I was wondering if anyone has a front trunion tool i could borrow in OC?

Or if someone can walk me through a non $250 way to replace my ftont trunion.

I'd like to hear the whole story of how you got to this point.

[javithewrench]

I have the bolt cutters and the hyd press style. Don't forget you will also need to headspace and possibly redrill your barrel to pin it. I also have go, no-go gauges for 7.62x39. I'm in bellflower, let me know

[kcstott]

The swell neck rivets mean that the receiver has to be bent open a fair bit to remove the trunnion. A receiver with rails and center support intact won't be easy to bend open far enough without damage.

The swell neck rivets are at the bottom, meaning the receiver has to bend open quite a bit.

WTH are you talking about??

to remove the trunnion and preserve the receiver is easy, Slow but easy.

Step 1 Pull the barrel.

Step 2 Center punch and drill out all rivets

Step 3 punch out any remnants of rivets

Step 4 Gently wedge o0pen the receiver with a set of pliers you only need to open it about 1/16" of an inch which is not "quite a bit"

Slide the trunnion out and you're done.


The thing I i would like to know what really going on with the rifle that make the OP think he needs to replace it.

[God Bless America]

1/16", but towards the bottom of the receiver. That's where the swell neck rivets are, and have dimpled the receiver walls inward.

1/16" deflection towards the bottom requires more deflection at the top. Some of the reveiver stubs I have demilled have been easier, others have been much tougher.

I don't know if you have been able to slide the receiver stub off a front trunnion without deforming the sheet metal, but I have not, and that's without the rest of the receiver resisting my efforts. I try to when I demil, but not too hard, as it is not that important. Maybe you have had better luck.

I agree as to why? My guesses are a cracked trunnion, or effed-up barrel pin.

[saki302]

Once the rivet heads are milled off, in my experience the rivets punch right through the other side if the barrel is pulled already.

It's going to be a major job including headspace if you replace the trunion but reuse the barrel.

I'd make an appointment with Randall- he can take care of all of it if you aren't able to or lack the tools.

-Dave

[Swampcrip]

I'd like to hear the whole story of how you got to this point.

Just finishing an 80 build i started a year and half ago.

[69Mach1]

https://www.google.com/search?q=Front+trunnion+riveting+tool&client=ms-android-hms-tmobile-us&hl=en&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjTmofQ6L7TAhVniVQKHVSjD24Q_AUICCgC&biw=640&bih=240#imgrc=H9jGRG4GNoyAFM: