What stops H&K from producing the SL-8 without the thumbhole stock. The thumbhole is poorly designed and hurts the web between thumb and index. I love my SL-8, but I would be happy to replace the thumbhole stock with a non-thumbhole stock. It also seems that we would not need to register the rifle. It only has a ten round mag and no other goodies to make it subject to registration. Anyone know of a replacement stock??