Some pics of my recently completed "Stock Block Conversion". The parts were all obtained through a combination of HKParts.net (imported through ###### Armory) and RKS in Spain. The conversion process itself was pretty straightforward, thanks to the excellent information provided in this sticky. Particularly helpful was the article on shaving down the genuine G36 Trigger Housing to fit the SL8 Receiver. In any case, it all came together once I figured out how to strip and reassemble the typically over-complicated German Trigger Mechanism. Mein Gott, what a pain in the arse the first couple of times!
The previous owner had the barrel cut to 18.6" and threaded 1/28. I was able to obtain a 1/28 threaded HK Flash Hider from HKParts.net to give it the correct look. When purchased, the rifle had been converted using the "Top Notch" one-piece conversion kit. I wanted something a little bit closer to the genuine article, so for that and a few other reasons (eg. to provide more weight in the rear to balance out the front-heavy weight of the match barrel) I decided to go with the HDPS aluminum Stock-Block system.
Without further adieu, the pics: