March 4th, 2017, 03:10 PM
Join Date: Sep 2013
Location: Pearland, Texas
Welcome from Southeast Texas.
Did anyone ever answer your question about the gas system?
A unitized gas system will either be welded or "glued and screwed".
You may need to disassemble your rifle to determine which method was used.
If there are signs of welding on the front band then it's obviously a weld job.
The "glued and screwed" method cannot be visually determined without dis-assembly; however, you can try turning the gas valve, if the valve turns it's probably not unitized using the "glued and screwed" method.
You didn't state what model M1A you have and why you think it may be bedded.