Congrats on your decision to buy an MP5. There is no finer transferable SMG IMO. I have a registered DLO trigger frame and a Fleming sear, both installed in MP5s - a MP5K-N and a MP5-N. I have UZIs too. I had a m11/9 (sold it, wish I had not). The only other subgun I really want is a Swede K.
It’s important to know that there are two types of RR MP5 (and other roller delay guns). The first and most desirable is the factory machinegun spec “pushpin” RR, where the front semiauto shelf was removed and the lower housing attaches using the front pushpin. This type of conversion allows the use of all factory MG parts and is mechanically identical time to a factory MG. The second is the “clip on” RR. These are semiauto spec receivers that use unregistered conversion devices in the trigger pack. Neal Smith made trigger frames (the steel box) that use all factory MG fcg parts, while Fleming, Ceiner, HTA, Wilson and others used unregistered sears. It is not legal to mill and drill a clip on RR to make it MG spec, despite the fact the receiver is registered. ATF holds that this would create two MGs because of the unserialized unregistered sear. The clip on RR is the least desirable HK MG conversion. Unless I stumbled upon a really really good deal (and I mean like someone selling for $7k), I would not buy a clip on RR HK.
The pushpin RR hk is very expensive, more so than a sear gun because of the purist factor among collectors.
As an aside, many Neal Smith guns have had their trigger frames removed from the gun and sold as transferable trigger boxes (worth far more). I spoke with Neal at Knob Creek last year and asked him about these. He stated he only registered the receivers, not the trigger frames, that the serial numbers on the trigger frames match that of the host receiver that was registered by him. He said ATF had called him about these and was apparently fine with the trigger frames transferring as the MG as long as the receiver had not been converted to MG spec. His trigger frames have all his info and serial number engraved.
Last edited by JoshNC; 09-05-20 at 21:23.
SLG Defense 07/02 FFL/SOT
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