AR-180B bolt hold open device
This week we started on the bolt hold open device. These are the steps necessary to make this part.
This is how the part comes from the laser cutter. We leave the pivot hole small to allow us to ream it to size. We also add material to the pointed radius to all us to machine it to size as it is very easy for the tip to be burnt off during laser cutting.
It is set up in the machining center to machine these two parts.
Once out of the machining center we start the bending process. You can see the two reference point to allow a accurate and complete first bend.
They are bolted together so nothing moves out of place
The upper press fixture is put into place.
The first bend is pressed
The first press is complete and a second press will be performed to tighten up the bend radius and make the second bend.
Set up for the second press
Next fixture is added
Completed bolt hold open.
Start and finish of the pressing
Ours vs. the original
Fits the rifle like it was made to.
Another picture of it in the rifle.