It may exist, but you could just leave it empty - won't hurt.
There are uppers that do not have FA on them "Vltor ....."
I do not understand why you would want to take it off???
i am doing a build and i dont really wanna buy one i never use it on other guns i have. just thought maybe could cap it off so at least dirt wouldent get in there.
Slight newb thread detour: if you were to get a slick side upper and encountered a bolt issue, what are your options?
I leave mine open... Stripped uppers without a FA are often more expensive, the plugs cost money, the FA without the plunger adds weight i could leave off (On ULW builds), etc...
If your a lefty you might get some oil spray back "AR money shot"

Or I could spend another $8 on ammo and not plug a hole that no gas or particles come out off... Just place some white tape over it and go shoot 200+ rounds... In my experience it will be clean.This is only $8.00
http://www.rifleoutfit.com/media/ca...ab33525d08d6e5fb8d27136e95/1/9/198053-1_2.jpg
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