Why not this one? https://www.quietriotfirearms.com/product_p/mr556sd-gb.htm split the upper and or the Can as well, someone here will take off your hands.............Complete rifles okay.....I can swing that.
I could use a non-NFA upper anyway.
http://www.hkpro.com/forum/hk-long-guns-sale/344106-wts-hk-mr556-lower-1-450-a.htmlI am in the market for a MR556 lower. I would consider splitting a complete rifle with someone who would like a complete upper. Contact me to discuss.