Buffer weight

[Klem]

Montana,

That's good information, thanks for that.

I'm off to check mine.

[Old Bob]

My drawing reads 6.672 +- .005

A good test is to see if the rear of the bolt carrier pushes the buffer back as the upper is closed on the lower. If the front of a buffer is chewed up by the buffer retainer pin or the pin itself is bent or broken, it is a sign the buffer retainer pin hole was drilled improperly or a short bolt carrier...The buffer should not impact the buffer retainer pin until the upper is opened..

Where did you find a drawing for the carrier? I have a penchant for collecting drawings & schematics... would like to add it to my collection.

Happy to say none of my buffers show any damage nor do the retainer pins. Yes, there is a perceptible push-back on the buffer as the upper is closed.

Thanks montana. Your info has been enlightening...

[montana]

[ATTACH=CONFIG]18051[/ATTACH]

[Old Bob]

Thanks montana! Much appreciated...

[Lastrites]

Another check is to pull the charging handle all the back and see where the face of bolt ends up in relationship to the back edge of the ejection port. The face of the bolt is supposed to stop between 1/8" to 1/4" in front of the back edge of the port. Have witnessed a couple of old jams in the past on guns that had the buffer disappearing behind the back edge of the port, the quarters fixed them.

[montana]

Another check is to pull the charging handle all the back and see where the face of bolt ends up in relationship to the back edge of the ejection port. The face of the bolt is supposed to stop between 1/8" to 1/4" in front of the back edge of the port. Have witnessed a couple of old jams in the past on guns that had the buffer disappearing behind the back edge of the port, the quarters fixed them.

Yup, a buffer can be drilled too short, causing a short stroke during recoil.. I have seen these in cheaper commercial buffer tubes..I have never seen a spec 1/8" to 1/4" for this, but if you have evidence of this or a drawing I would much appreciate seeing it...