Buffers are a big help on the mini as far as keeping it quieter and adding to the protection of the parts of the rifle being slammed by the Op Rod.
The one problem I have seen is the buffer is many times too thick on the front of the rifle on the gas block.
A standard buffer made for a 45 semi auto works great as is put on the end of the OP rod, but many front buffers are too thick.
The thing to check is that the gun easily goes into battery (closes) with the buffer installed.
If it is too thick and the bolt has a hard time fully locking up, you are going to need to thin the front buffer until the bolt easily fully closes.
The too thick front buffer is a cause of many problems with the Ruger,
Having problems? Put a piece of 400 wet N Dry sandpaper on a flat surface and run the buffer back and fourth until you reduce the thickness.
I have found som that need to be thinned to hald of their regular thickness.
Myself, I just use the 45 Auto buffer in the back and don't bother with the front buffer on the gas block. I prefer my rifle to br 100% reliable.
My Best, John K