We have finished welding all the cocking handles on the upper receiver/slide. The next step is to finish the bolts and fit them to the upper receiver. Then the bolts go off the heat treat.
This is how the project looks now when we finished welding all the guides on.
Now all the cocking handles are attached.
And a close up.
On to the next operation.
What is the o.d. and i.d. of the seamless tube used for upper receiver slide, and also the mass(of finished machined one), if you know?