Well Im having trouble deciding between the Larue 556 OBR (18" or 20") and a HK SL8-6 (20") I was originally getting the Larue, but then the HK popped into my head. This rifle will be used as a long range varminter/fun in the field so weight is no issue. From what Iv researched the SL8 shoots sub moa (one report of sub moa at 200) and of coarse the OBR does. The OBR has more parts available, is easily customizable, and just adds a new upper/lower. The reason Im considering the SL8 is because its piston driven which should keep it running cleaner. But since its no duty/combat weapon thats no Huge deal.. So I guess my main thing is the accuracy of these two, anyone have both? or have some groupings from both? thanks