These are my HK SL-8's  and a USC45 that I did a Rite Dye job on. Took completely apart and put into a big 20 gal bucket on the stove. Kept the water to just under a boil for about 12-18 hrs. The spacers are still grey they do not take the dye.

The top SL-8 is stock with a G-3 hand guard and bipod also the carry handle with a scope and a dot above that. The Bipod is a POS......IMHO. The scope works great and is clear. The dot is also OK.

The other SL-8 with a Aimpoint is the AR15 Conversion

The USC45 is also stock except I did the slot cuts to the forearm 2 on the side one on the bottom

I have an extra SL-8 forearm which I am going to try and put some vent holes on. Don't know if I will do like the G-3 or do my own design.

Sweet.  Kinda a matte cloudy finish now, but far far better than the grey.  What kind of groups are you getting on those?

The cloudy finish is from the camera. Actually they are black
I am getting Quarter size groups or smaller out to 200yds with the SL-8's the USC are about the same at 100yds. 5 shots look like a shot gun slug went through the target