If you are going to the trouble of taking down your gas block, have a real bushing in hand made from hardened steel to replace the existing one. There are many suppliers or pointers to supplier here on this site. If you buy only one size, get the 0.05" ID bushing.
I think you should check the diameter of your bushing before as I believe you may discover the actual size is closer to 3/16" diameter.
Dents could be caused hitting the scope or charging handle.Will the roll pin or the .05 gas bushing remove the dents I get in my brass? The Range Officer said the mini ejector spring is to strong and that is what is denting my brass. It currently is throwing @ 2:30 20+ feet. I have a 911 type buffer installed.
sorry no pics. dents about half way up cartridge.
I did the roll pin trick a while back. Best I can measure it came out at .046". The brass ejects at 6 to 8 feet now compared to 20. If you just want to tinker it's not hard to do and it will work, but as others have stated there are some good bushings out there to be had.