BB2K Airsoft talks about the sniper conversion kit for the VFC HK417... "The VFC HK417D GBB is sold only in the 12-inch version. Who wants to turn it into a DMR sniper, can beef up the 417D with a 16-inch or 20-inch Sniper Conversation Kit. I'll show you in my video the 20-inch version. For me, the 20 Inch version is best looking HK417D."