TPMs popular take on the HK MP5SD
Texas-based TPM Outfitters has sold over 300 of these great little 9mm beauties. The TPM P5SD is a short barreled rifle with an integral suppressor that is 99 percent HK MP5SD with the exception being that the four-position switch only goes to safe and pew, not pew-pew-pew, or pewpewpewpew. These guns as they run are $3850 plus two NFA tax stamps (one for SBR, other for suppressor).
Some shots of the build process, which is all done in-house.
Transferable select-fire sears, if you can find them, are $29,500 up to $33,000 for the registered sears or packs, so you can get the full pew, you just have to pay for it.