https://www.brownells.com/rifle-part...-prod3891.aspx

https://i.ebayimg.com/images/g/ibAAA...yV0/s-l400.jpg

these nylon recoil buffer inserts for the browning BAR hunting rifle ,
are a wear item like fan belts and brakes on a car,
I generally keep a handful on hand
numerich gun parts, and midsouth and midway and my local gunsmith are currently out,
or on back order and Id like to purchase a few
but the only ones I currently find are listed for $27 EACH vs the typical $5 each they normally sell for

I have owned Browning Bars for 36 years and I have never had to replace one of those buffers . Never. Its pinned in between 2 metal plates . Its not even a moving part.
It really wouldn't get any abuse unless maybe you are reloading some real heavy high power loads that are slamming into the metal backstop plate..

your correct that they usually don,t need to be replaced ,
but they are a potential wear item so about every two years I replace them,
just as I disassemble and clean and lubricate all the moving parts
and I darn sure inspect them after and before every hunt or trip to the range.
I also replace springs and small parts at the first sign of wear

https://www.brownells.com/schematics...aspx#r32sid382