Hey everyone. New to AR builds. I did build a lower and thought that was easy enough, have another on the way.

 

I am a little uneasy with upper builds. I don't have the proper tools, which I can eventually get, but the gas tube alignment and headspacing worry me a little.

 

PSA has blemmed uppers for $39, so I bought 2. One is for a friend. He has a carry handle upper, which he's not crazy about anymore as wants a flattop. Here is where this blemmed upper comes in.

 

He doesn't have a ton of cash on hand right now, so I was wondering of moving all the parts to the new upper is possible? Would it cause any problems with the barrel and bcg?

 

Any suggestions or tips on getting this done properly and painlessly.

 

Thanks all

 

 

-Frank

If everything is done properly then why not? Ar's are like legos,all(most) of the parts are interchangeable

 

 

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No head spacing involved. Most barrels have the extension already installed.

I would only worry about head space issues if I were mixing up barrel/extension and bolt around. PSA's blemished uppers and lowers typically have very minor cosmetic problems and I haven't seen their "blemishes" cause figment issues.

 

You'll obviously need all the correct tools as if you were building it from scratch so get ready for that unless you're having a gunsmith do it for you.

Oh ok. Seems like I would only need to worry if changing barrel extension, which didn't even cross my mind. Sorry for the stupid question, I'm starting to get it a little more.

 

That's perfect then. All we are doing is moving all the parts over to a new upper. He has a 16" bull barrel with no compensator at the end. It has a cutout, but is not threaded.

 

Awesome,, thanks everyone. You put my mind at ease.