Autonut Posted February 7 Report Share Posted February 7 I am very new to the NFA “full auto” world and still trying to understand all the intricacies of NFA weapons. I own a factory 1984 HK MP5 (not a conversion) and it has a pictogram HK MP5 Trigger Group 3 position (0, 1, F) installed. If I buy a pictogram HK MP5 Trigger Group 4 position (0, 1, 2, F) and swap it out, will the weapon then operate in the 0, 1, 2, F modes. That is, what makes my MP5 full automatic, is there an auto sear contained in the Trigger Group? To me that does not make sense because if I bought a 4 position Trigger Group and that had an auto sear, then that would be considered a NFA machine gun also? Quote Link to comment Share on other sites More sharing options...
subgun24 Posted February 7 Report Share Posted February 7 (edited) Your receiver is registered as a machine gun. The fact that your receiver can accept a double push pin FA trigger pack is what makes your gun a machine gun. Any gun that can accept an unmodified FA trigger pack is a machine gun. Therefore you can freely buy those trigger packs and swap them in and out. A semi auto HK94 or SP5 will not accept those trigger packs unmodified, therefore someone with an HK94 and SP5 can also buy those trigger packs freely. Edited February 7 by subgun24 2 Quote Link to comment Share on other sites More sharing options...
Chef Posted February 8 Report Share Posted February 8 If your Mp5 is as you say, an original, factory Mp5 (registered receiver, pushpin, swing down trigger group) then it will accept any type of factory Mp5 trigger group and function as the trigger group indicates. FA, 2rb, 3rb etc. What makes your Mp5 "full automatic" is a combination of the parts located within the trigger group and the bolt carrier and a receiver that is able to accept these factory, unmodified parts. But as far as the government is concerned, the receiver of your Mp5 is the registered "MG". Everything else is just parts. But yes, there is an "autosear" in a factory FA trigger group. In an HK it's referred to as a "trip lever" or "sear catch" depending on who you talk to. But in their original configuration, they are just unregulated parts, much the same as a factory autosear in the M16 series of weapons is. Those parts can't be installed in an unaltered semi-auto HK and make it shoot FA. Don't think of the factory trip lever (or sear catch) in the same way you would a AR RDIAS or a "transferable HK sear". Original factory HK full automatic and burst trigger groups are not considered the registered part of the weapon, and as such, they are unregulated and free to buy and own without any registration. They are not "MGs" in the eyes of the law. So you can buy and possess them the same as you would a magazine or a handguard. 1 Quote Link to comment Share on other sites More sharing options...
Gobbler501 Posted February 12 Report Share Posted February 12 No swapping to a four position trigger housing does not make your gun shoot 2-round burst or full auto. 1 Quote Link to comment Share on other sites More sharing options...
United Surplus Arms Posted February 12 Report Share Posted February 12 (edited) 3 hours ago, Gobbler501 said: No swapping to a four position trigger housing does not make your gun shoot 2-round burst or full auto. in the OP's case (factory MP-5), it absolutely WILL fire 2RB or FA. (presuming the housing contains the corresponding trigger pack) Edited February 12 by United Surplus Arms 1 1 Quote Link to comment Share on other sites More sharing options...
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