Please educate me on AR buffers

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MrCleanOK

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My AR currently has a 16" barrel, carbine length gas system, carbine receiver extention and carbine buffer. It's straight up carbine.

I want to build a bull-barrelled, scoped upper and use it interchangably on my lower. I know my collapsible stock isn't ideal for a scoped gun, but I can live with that. And, I have an VLTOR Modstock, good tight fit, no wiggle. It will do until I decide to get a dedicated lower with a fixed rifle stock.

I know there is lower pressure in a standard length gas system. Will a 20" barrel and standard length gas system still cycle a carbine buffer? Do I need to get a lighter buffer to use with the longer upper?

Somebody help! :confused:
 
A rifle barrel will run just fine with a carbine buffer & tube. The rifle buffer is actually significantly heavier than the carbine buffer (5.2oz vs. 2.9oz). The different springs and different length buffer tubes play a part too.
 
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