I purchased my first 10/22 a few months ago, a basic used carbine. My goal was to have an inexpensive shooter. I polished and modified some parts myself. The only pre-made parts that I purchased were an extractor and a few magazines.
I thought that the price for the polyurethane buffers being sold was high and figured I could come up with a cheaper part.
I ordered 6" of extruded 1/4" black polyurethane rod from McMaster-Carr (around $12 with shipping, enough material for 4 buffers). It was several thousandths over 1/4" and didn't fit. McMaster-Carr refunded my money.
I found
Acrotech online. They make 1/4" precision cast polyurethane rod in different durometers. Their 80A durometer is orange and I suspect the same material as the WeaponKraft buffers. The 1/4" size is available in 12" and 24" lengths, around $15 and $20 respectively.
I spent around $50 (inc shipping) to order two 24" pieces, orange 80A and red 95A. I figured I could cut them up and sell some buffers myself.
The red rod was about .252" and fits beautifully, easy to remove for disassembly. The original orange rod was around .255" and did not fit into the hole. When I contacted Acrotech they were very helpful and had someone mic some stock and sent a replacement that they claimed was exactly .250". When it arrived it was actually closer to .253" and a snug fit.
This material is not easy to cut accurately and square. I ended up drilling a hole in a piece of wood to support the rod while cutting. The cuts are still not perfectly square but close.
I've spent a lot of time finding, ordering, re-ordering and cutting. I have one red buffer in my rifle (I like the way the red fits, easy to remove and reinstall for cleaning), have given one each to a friend, and the rest are still sitting in the basement. All for only $50 plus my time.
My recommendations would be to:
A) Order a pre-made buffer from one of the companies selling them
or
B) Go the cheap route and use a nylon bolt.
If I knew then what I know now I would choose A.