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Posted: 3/25/2013 6:07:14 PM EDT
| I have an Aero upper receiver, that I am trying to install the forward assist assembly. Either the hole in the receiver is too small or the roll pin that came with forward asseMbly kit is too big. Any suggestions on how to remedy this situation/ |
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Install the pin from the bottom...
Hides any marks made when installing... Lube pin and hole.. An Arbor Press would be the ideal tool to install any sort of pins. But the one main tool I have found to invaluable when installing any roll pin (even with a arbor press) Is a Roll Pin Starter Punch!!! Here are the ones I have made for gas-tube pins and forward-assist pins.. 
The Starter Punch will hold the roll pin while you tap it in place. Then finished installing the roll pin with a hammer or a arbor press!! Good Luck |
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I have had this problem a few years ago when I purchased several stripped uppers from a well reguarded company on AR15.COM. They sent split pins with the FA and there was no way I was going to get those pins in unless I was pressing out aluminum from the hole as the pin was pressed in. The only solution using the supplied pins was going to be to drill the hole slightly bigger. I did not want to do this any remove any anodizing. I measured some of the supplied pins when compressed until the split was closed up as tight as I could get it and they were still oversized several thousanths of an inch. I ended up purchasing pins from M-CARR and they were sized perfectly. So I have seen some split pins that will not close down to the smallest diameter spec they give. Roll pins are better for this and will roll up small enough, but split pins can be a real pain if they won't close down small enough to fit in a finished hole.
Just one thing you might want to check. |
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Quoted:
Install the pin from the bottom... Hides any marks made when installing... Lube pin and hole.. An Arbor Press would be the ideal tool to install any sort of pins. But the one main tool I have found to invaluable when installing any roll pin (even with a arbor press) Is a Roll Pin Starter Punch!!! Here are the ones I have made for gas-tube pins and forward-assist pins.. http://photos.imageevent.com/scl_electronics/cfguns/ar15/websize/Roll%20Pin%20Starter.jpg The Starter Punch will hold the roll pin while you tap it in place. Then finished installing the roll pin with a hammer or a arbor press!! Good Luck Excellent work ! |
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Quoted:
I used my big knipex pliers and pressed them in. Finished off with a punch. Same way I do with trigger guards as to not break them. Pressing is a lot smoother than beating. Yes it is...but we knuckle dragers need to bludgeon something....:) But, I have two nice arbor presses and I don't use them all that often...still use punch and malet most of the time...and have never broken anything YET! Bret |
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