I have factory HK SD supressors x2, HK-USA Supressor and three made by Ken Clark from TPM outfitters. By far TPM's are the quietest and well made for the SD. If you are looking for factory look, build quality, lettering etc. B&T USA is indistinguishable from factory HK. B&T Switzerland is the OEM supplier for them. If you need anything call me or PM I am a B&T USA distributor 08 FFL and SOT.
Have a mac 10/45 with multiple uppers, stock, bolts,and magazines,located in northwest ohio just off 23, I am a 08FFL and C3SOT,can do your NAF transfer, gun is currently on a form 3 in Ohio. If intrested give me a call, cell phone#419-490-0015. you can come up and see the gun if you want Dublin is 2 hours south of me.