There are several out there. I own a real H&K F/A trigger pack and mp5's in 9mm, 40 and 10mm. Right now you best bet is to buy a flat or two and a H&K parts kit. This will give you all H&K parts ( you still have to replace the 922 parts ) and this will give the the best bang for not allot of cash. FA mp5's are running 20 grand. Genuine H&K semi mp5s are running in the 6 grand area. I have one Bobcat 94 that has preformed without issue for me.