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4/13/2006 4:46:54 AM EDT
Been a while since I did a short upper, can anyone pass along any tips they have about getting one to run properly? Barrel is 10.5" My gas port is opened to .093 and I plan to apply a DFender ring to the extractor. What are your suggestions?
4/13/2006 4:58:54 AM EDT
[#1]
Look in here:  

10.5 Upper: #%*!&@ thing won't run!

From the M16/Full Auto forum

4/15/2006 5:01:57 PM EDT
[#2]
Good luck.

Be prepared to repeatedly fiddle with it then for no good reason it will run fine.  You will have no idea what really made it work- it will just work.

Been there, done that.....(obvious?)
4/17/2006 11:51:49 AM EDT
[#3]
One of these:
D-fender / O-ring / XD spring from wolfe

Heavy buffer (only needed for full auto)
4/19/2006 11:41:14 AM EDT
[#4]
I have a 10.5" upper and it runs perfect, stock from the factory.  No Dfender ring, no super springs, just throw it on the upper and run her till you run out of ammo.  I am not sure about my gas port, guess I can mic it and see the size.  I also built the upper for my cousins SBR and didn't do anything special but put all the parts together.  Neither have had a problem to date,  and now its going on 3 years they been out there.

.02
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