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Posted: 4/13/2006 3:46:54 AM EST
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?
Link Posted: 4/13/2006 3:58:54 AM EST
Look in here:

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

From the M16/Full Auto forum

Link Posted: 4/15/2006 4:01:57 PM EST
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?)
Link Posted: 4/17/2006 10:51:49 AM EST
One of these:
D-fender / O-ring / XD spring from wolfe

Heavy buffer (only needed for full auto)
Link Posted: 4/19/2006 10:41:14 AM EST
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.

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