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Posted: 1/26/2007 7:19:10 PM EDT
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So, I'm a bit of an HK C3 newbie. Got the AR15 sear thing down, though :-) Want an HK MP5/40. Ones I've seen are too expensive. Would rather just get a vector clone and a sear and be done with it. But, I assume it's not a simple 'drop-in'. Would have to firstly pay somebody to install the sear into the semi trigger pack. Then various other parts in the semi-auto trigger pack have to be modified. Also, a FA bolt/carrier must be installed. What if I bought a trigger pack with the sear already installed. Is it the trigger pack itself that manages the selector settings? Or is that the job of the complete lower assembly when combined with any trigger pack + sear? I assume an MP5 is an MP5, so caliber wouldn't make a difference. Perhaps tolerances between HK and Vector would be slightly different, but lets pretend that's not a factor. Just trying to get the basic picture on how to get a Vector MP5/40 clone to full auto. |
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If you want the end result to mimic a factory gun with pictogram lower, you will need to have the sear installed in a 4 pos burst pack (expensive) unless you can find one with a sear already installed. On both the 3 and 4 position pictogram "ambi" packs, the selector is held in position by an internal mechanism. On the SEF (my choice) type lower, the selector is held in place by a ball detent in the selector/safety lever that 'locks' into the depressions of the trigger housing itself. If it were me, I would just get a sear that is already installed in an SEF (I like simple) pack because I have no use for the rather fragile and complicated burst feature. I'm also right handed so, aesthetics aside, even the 3 pos "ambi" pack is of no consequence to me. Both types would require the trigger pack housings to be clipped for use on a semi. |
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Excellent. I don't really care about the pictogram. So I could, for instance, buy an SEF trigger pack with sear, clipped SEF lower and a full auto 40S&W bolt/carrier, and thats it? I suppose as long as its a registered sear, I could have it installed in a picto lower at some point in the future. Thanks for the pointer! It's hard to get a straight answer about the whole HK sear situation. |
Yes and, yes. |
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Quoted: What do you mean by a registered sear? Was is registered before the '86 ban and considered an automatic preban weapon? So dropping it into a vector gives you a legal full auto gun? Yes. Also how does this relate to the ar15? thanks It doesn't relate to the ar15, but this is the HK forum in the ARF.com website |
The AR-15 equivalent of the REGISTERED HK-sear is the RDIAS (REGISTERED Drop-In Auto Sear) - this is one of the two ways to LEGALLY convert an AR-15 to an M-16 .... Hope this helps .... |
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Here's some info on the Registered 'Drop In Auto Sear" DIAS Here's some info on the 'Registered Lightning Link' RLL Here's what a lot of people consider to be the definitive text on HK conversions |
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I wanted to make one more comment concerning your original question about making an MP5/40 full auto. I also wanted the 40 caliber MP5 but I went a bit of a different route. I purchased a german MP5/40 parts kit, a Special Weapons MP5/40 receiver, and had Investment Grade Firearms assemble it. I have a sear installed in the 3 round burst, 4 position pack (done by RDTS). What I wanted to add to the discussion is that it sounded like you had decided to get a sear in an SEF pack and use it with an MP5/40. The problem with that decision is that unlike all other HK weapons, the MP5/40 has a bolt hold open device. The bolt hold open will interfere with a normal trigger housing and so the housings for the MP5/40 have a cut out on the left hand side to accomidate the bolt hold open. Since HK had moved beyond SEF trigger packs by the time the MP5/40 came along they don't make any SEF housings with the cut out for the hold open. If you want to go SEF (not a bad idea, simplicity is nice) you will have to modify the trigger housing yourself to make room for the bolt hold open. This can easily be done with a dremmel but just be aware that it will have to be done. The other alternative is to get a sear installed in an ambi pack, either a burst pack or a Navy pack and get the HK factory housing that has the cut out already there. For the record, the RDTS 3 round burst trigger pack and housing cost $1100. It is a simple matter to install the sear into a sear ready pack, by the way. They sent me the pack and I installed the sear myself after I removed it from the SEF pack it came in. |
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AllanW, VERY excellent write up. Very much appreciate the info. Due to other reasons, I decided to look for just a sear without the pack. I'll definitely keep this in mind for when I get ready to assemble all the parts. Looks like more reading is in order to be able to come up with a workable plan. I do like the idea of a parts kit + receiver. Get yours from gunbroker? Or is there a good place with them available? Thanks again for the pointers. |
another $700 gone
extra parts  http://rapidfire.targetweb.net/cgi-bin/store/agora.cgi/agora.cgi?cart_id=3390872.11098*1J5wn2&p_id=01963&xm=on&ppinc=big |
I got the parts kit from a guy locally that bought 5 MP5/40 parts kits from the Conneticut State Police. One of my mags still says CSP on it. The receiver was purchased from Special Weapons when they were selling the bare receivers for the 40/10. I don't think they are selling those any more and even at the time, they were extremely expensive ($1000). Between the parts kit (almost $2000), receiver and the labor to assemble it all and get it working properly and refinish it, I spent about $4000. Ouch. Looking back, I probably wouldn't have done it the same way if I were doing it again, but at least I have a fairly unique item: a mostly German MP5/40 that looks great and is registered as a pistol so it doesn't have to have a funky barrel extension on it when I'm not using it with my sear. |
THE metal trigger frame is basically useless but all other parts ( not the full auto disconnect) the hammer,triggers, (pins) can be modified to semi auto .. sbr's aren't subject to the import parts restrictions . THE plastic full auto frame can be used to look like a full auto gun! FUN TIMES THE TRIGGER FRAME COULD BE MADE INTO A SEMI AUTO TRIGGER PACK.
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