This is an evolution HK416. Externally it's in very good condition, it looks almost new. It's non firing at the moment. I got this as a boneyard with a failing efcs. I removed the efcs and replaced it with a standard wiring loom with standard v2 trigger shuttle. On full auto it fires fine. In semi it fires once and stops. I'm sure this is a problem where the cutoff lever is disconnecting the connector shuttle but the shuttle isn't returning home. Therefire trigger loses contact with the shuttle. When it's in this failed state the trigger feels lighter to pull which is why I think the trigger shuttle is at fault. At this point you need to disassemble the gearbox to get it firing again. It's a quick change spring which makes disassembly a bit easier. 

I imagine fitting a Perun or similar will get past this problem or you could mod the trigger shuttle so it operates correctly. 

I do think that everything you need to get this working is here. You just need the time and patience to get it fixed and I've just run out if patience. 

£130 posted.