To my understanding the OAL that you put is what you can go up to and not exceed that length. But you can go backwards and go shorter.

Samson I used my mini mill to mill the relief cuts.

I'm in the process of trying to develop a safe sub load. But from everything i have read is you will have to manually cycle the weapon.

http://youtu.be/xgE9ZOFBUhA

My latest video shooting subsonic and regular ammo through it.

I didn't feel picked on at all, I'm glad this topic started as a way to get more info on the subject.

I did try drilling the center first with a 1/8" bit and then forming , but seemed to end up more off centered. That's why I found punching the center to form a solid divot made the best cone shape as it really cradled the ball. Once they were all formed I pressed into the tube and made the end ...

Desertland the way I did my freeze plugs I had also searched around on this forum at other builds. I had read sub-sonics build and saw that was his way of treating the plugs so I went that route. Not sure if it accomplished a lot but did seem to at least surface harden them. Only time will tell and ...

I got 1.5" plugs from http://www.clipsandfasteners.com/mobile ... aspx?id=89

Overall was at 10.5" and it weighs 1.70 lbs.

I cold formed them , I had a few that did however come off centered during the press so I had to scrap them. Just trial and error but can be a pita

Dan

I originally hadn't found SS PLUGS but now with that link I may order some for a future can. Stainless would be the best choice. Especially with stainless tube and internals.

I had attempted to drill one afterwards and was noticeably harder. Not sure what the actual hardness was but seemed to do the trick.

I actually used a large bench vise , placed plug in socket and then used a steel bearing to push the center in. I found if you center punch it and make a large dimple when you press it the center will tear and start a small hole you can ream out with a drill bit. Heat treating I just heated all the ...

These are all I have to show what the internals look like.

I will see if i can find some more pictures. Here is a link to my go pro video of me shooting it today.
http://youtu.be/HXUeyet3nRQ

Alright the link to YouTube should work now.

Well back in august I got my stamp back. I had been looking over sub-sonics build along with others to get a idea of what i want for my first can. With limited use of machining tools I decide to go the freeze plug route. The ar I build this for uses the ops inc muzzle brake and collar system. So tha...

Just got my form 1 approved today can't wait to start a build using sub-sonics ways

I filed 7/24/14 and was approved 8/17/14