[HiBC]

If you do bush it,you have a given wall thickness in the receiver.Think about the relationship of the diameter to the wall thickness which is the length vs dia of your bushing.

I think I would go for bushing down to .154 pins and get a new,common hammer and pins vs the .170 original.

But,Im still in the "new lower" camp.

If you can find a design drawing,setup based on a location from whatever datums they used to design the reveiver,then bore the holes with a small carbide end mill.That black anodizing is hard!expect it to dull your cutter.

If you try a drill/reamer trick,the drill will deflect to the worn hole.Boring with an end mill will give you a location.

If they are only a little loose,and you want to try a patch job,supplemented by your new,anti-rotating pins,get about a .250 dia ball bearing,support the receiver real well,set the ball on the worn hole and rap it with a ball pein.

You will do something like a primer crimp.The hole will get a little tighter.

If you get fancy,use a small center drill to put a dimple in a bar so the ball wont roll off,put the bar in a vise,reach the ball and bar inside the receiver,and use a clean,square ended punch on the outside to crimp the hole on the inside the receiver.

If that doesn't work,cut it for bushings.

Another option,negotiate with your anti-rotation pin folks.Tell them,for worn guns,the ought to offer a kit of1.5 mm oversize pins and a hammer to match,and please make you one.