I was looking at a Colt polymer buffer that I have on hand today and threw together this quick image of different Colt buffers to give you a perspective of size and weight.
This reminds me that I need to add an Edgewater buffer to my collection.
The Colt AR-15 Resource
"A site dedicated to the history of the Colt AR-15 rifles, carbines and associated items"
The Colt AR-15 Resource 
The whole buffer thing is confusing…. I’ve got a supervisor that wants to put H3s into everything… It doesn’t matter what you say, he read it on a blog and that’s it. He such a nice tool…. he, he, he, 😊😊😊
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