Are they chrome under the black?
yes . chrome carrier .
whats the best way to clean them up?
If it's paint you could try some 'paint strippa' and steel whool wearing rubber gloves. Usually gun paint is baked on really well and very hard to remove, low grit sand paper may be the best way for the home user, but the best way if you have it, is a bead blaster.
I have done quite a bit of car and motorcycle work over my many years and used a bit of my equipment to strip and polish my bolt. I came out perfect. You can make up the same unit. I have a brass wire wheel and cloth buffing combo on a grinder frame. You use the brass wheel to remove all the paint, lovely for getting in all the grooves, then get some jewelers rouge. I have a brick, but you can get smaller quantities. With the cloth buffing wheel, apply rouge then buff to the extent you desire. Mine came out like chrome. There is absolutely no effect on the bolt. It is forged steel and not a mark was made on it by this process. Just finished mine tonight and it looks georgeous. Same sort of setup they use in chroming shops to polish alloys and steel.whats the best way to clean them up?
Never use sandpaper or sand (bead) blasting unless you want to polish out the bolt for the next year...If it's paint you could try some 'paint strippa' and steel whool wearing rubber gloves. Usually gun paint is baked on really well and very hard to remove, low grit sand paper may be the best way for the home user, but the best way if you have it, is a bead blaster.
I have done quite a bit of car and motorcycle work over my many years and used a bit of my equipment to strip and polish my bolt. I came out perfect. You can make up the same unit. I have a brass wire wheel and cloth buffing combo on a grinder frame. You use the brass wheel to remove all the paint, lovely for getting in all the grooves, then get some jewelers rouge. I have a brick, but you can get smaller quantities. With the cloth buffing wheel, apply rouge then buff to the extent you desire. Mine came out like chrome. There is absolutely no effect on the bolt. It is forged steel and not a mark was made on it by this process. Just finished mine tonight and it looks georgeous. Same sort of setup they use in chroming shops to polish alloys and steel.