0% Suomi

A little progress today on the lug area I am getting to the part where one mistake will put a lot of time into the scrap bin. I must have checked things over 5 times before I cut lol. There was a fair amount of angles and math that could have gone bad.

This was my setup. There is not actually any metal removed yet. The black sections are sharpie so my dumb *** milled out the correct places.


first set of sides



second set of sides



clearing

removing stock for mag well



punch though



rough mill well


I had some issues clearing the chuck. A long endmill was necessary (not my first choice for side milling)



finish mill with correct radius corners

Milling for the front filler attachment



clearing hole for feed ramp

Milling bottom of ejector port



Top of ejector port



Cleaning sides



Finished port

Spotting ejector hole



Drilling



Ejector test

Fit on the shroud to receiver. I made it a little tighter than original. Its a nice firm fit...certainly will not fall off

Milling demilled front section to work with my receiver.



Fit of parts

Jumping over to the barrel shroud release. I was not satisfied holding it in a vise to drill out the post and tap. I made this jig to ensure lineup.



With the lever



In lathe ready to be worked on

More on the latch mods. It was tapped it for a 10-32 button head cap screw.

drilling




tapping



finished

I decided the only way to turn the completed front section would to be in a "socket". The section sits on a shoulder on the nose and is secured with a setscrew

turning ID of socket








Next up is some stock for the body of the tube. I found something that was close in ID and OD.

Boring in lathe.



Before I committed to having a overly long piece I had to cut the barrel lugs (and blocking lug for SBR)



modifying barrel (now extended) for blocking lug






After that the blocking pin preventing a FA bolt from going into battery






In socket ready to be turned



turning shoulder





Tube section shrunk on



Complete tube in lathe and tacked. Although I do not recommend welding in a lathe, it seemed the only way I could hold everything straight without building a fixture. If you do this use a TIG, If any other process cover everything with aluminum foil to keep the spatter from damaging, most important is to keep the ground as close to the work as possible and never crossing a bearing.



parting to final length




starting to turn OD

finish turning OD



threading end



end threaded



tube done(for now)