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Posted: 9/14/2006 4:08:20 PM EDT
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Hey guys. I want to get some information on the nitty gritty of converting a USC/SL8 to a UMP/G36 clone. I have done a thorough search here and at HKPro and have found out a lot of information. But there are still some thing I am unclear about. First, are HK guns registered different from ARs? For example, I keep reading about people buying real G36 and UMP lowers but never hear anything about registering them. Does this mean the uppers are the part that is registered? Second, concerning a G36 clone from a SL8, I have read that the only way to get close to the correct appearance is with a upper receiver stock block from a person on the HKPro boards. His SL8 looks close to a real G36 but he said it still is not the right dimensions. What I would like to know is, why can't people get stripped G36 uppers to use on their SL8s? Are they just not available? Some of the other parts kits look like G36 rifles but are too long in the buttstock area. And that turns me off personally. Third, do real UMP/G36 lowers fit USC/SL8 upper receivers without any modifications? I would assume so but I am not sure of the intercompatibility of HK guns. And finally, concerning UMP clone builds, do they also have the same issue as the G36 clones in the buttstock area? DO they too look too long in the rear of the receiver? I have seen pictures of UMP clones but can't tell like I can with the pictures of the G36 clone. Thanks fellas. |
The upper receiver is the "firearm". The lower just holds the trigger pack, just like on an HK 9x gun.
see above
The UMP lower works with the USC although it has to be modified slightly to remove the full auto capability. This requires putting a block in it and installing the USC fire control parts. A G36 lower is much more difficult and would require the stock block on HKpro (which requires milling the back of the receiver off).
UMP clone builds look much better than G36 clones. HDPS makes a stock block that looks pretty close to the real deal. www.hdps.org www.tacticalexcellence.com Some people have reported success with SW/Top Notch conversions but I personally would never touch their |
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1) On your first question, you are correct. The upper on a USC is the serial numbered part... 2) I don't have SL8/G36 so I have no idea there. 3) There are minor modifications that need to be made to the UMP lower. You have to open up the hooks on the front and you have to slightly open up the area where the mag goes on the upper. 4) From what I've seen of the UMP block that Tactical Excellence makes, it does not extend the stock too far back. It is more of a transition piece that binds the upper, lower, and stock together... Spooky |
What do you mean by "registered"? Are you referring to what portion of the rifle is the controlled part (has the serial number that is entered on the 4473), or are you referring to the NFA registry (Class 3)? |
I am referring to the part that has the serial number (like an AR15 lower has to be registered but not the upper). The ones aboved you said that I had the right idea. |
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So you guys are saying we (civilians) can buy true HK UMP (and sometimes G36) lowers but not uppers? If so, why is this? I don't know how HK makes them so I don't know if there are stripped UMP/G36 uppers out there or not. Or does it have something to do with the US-made parts count? Thanks. |
The upper receiver on both is the part with the serial number, which is defined by federal law as a "firearm". They are not "registered" unless they are made into NFA firearms. While this terminology is commonly used among gun owners, it is incorrect. |
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Bump with a report of my last question. So you guys are saying we (civilians) can buy true HK UMP (and sometimes G36) lowers but not uppers? If so, why is this? I don't know how HK makes them so I don't know if there are stripped UMP/G36 uppers out there or not. Or does it have something to do with the US-made parts count? Thanks. |
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yes we can buy UMP and G36 lowers(they are not registered, the upper is, backwards from an AR) the lower will not bolt right up to a UMP however quote]Quoted: Bump with a report of my last question. So you guys are saying we (civilians) can buy true HK UMP (and sometimes G36) lowers but not uppers? If so, why is this? I don't know how HK makes them so I don't know if there are stripped UMP/G36 uppers out there or not. Or does it have something to do with the US-made parts count? Thanks. |
Thanks. That has some good information. So let me see if I have this straight about the real UMP/G36 uppers. We (civilians) can't get a real upper because, since that is the part that has the serial number, it is somehow restricted via the over-seas weapons import bad? I am sorry, but it is not clicking just yet. As you can tell from my signature, I don't care if the question sounds dumb.  Thanks guys. |
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The upper is the receiver and is a machine gun in and of itself. The 'lower' on HK guns is just a replacable trigger pack. For the USC conversion you use the USC reciever and modify a UMP trigger pack to fit the USC and hold the USC trigger parts. You but a stock adapter to install a UMP stock. The only other mod is to cut or file a little from the USC reciever to accept the double stack UMP 25rnd mag. It's a very simple do it yourself project so there is no need to send it off to have it done. here's mine. I opted to have the origional barrel cut and threaded instead of going with a $300 aftermarket or more expensive genuine HK UMP barrel.\  |
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