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View Full Version : Can you home-build an 80% non-select fire "MP5"


ching
05-14-2012, 11:07 PM
Say if i wanted to build an 80% semi-automatic fire "MP5" like how the AR and AK guys are doing.

Will it be legal if:
1) I used a 16" barrel
2) Fixed or adjustable stock no shorter that 30" fully collapsed, over all length.
3) MP5-SD type of barrel shroud
4) 10 round magazine
5) Bullet button type release
6) Semi-automatic only

I'm just curious. seeing how there are MP5 clones in .22lr + homebuild 80% long guns.

Anyone want to share photos of a home-built "MP5"?

ke6guj
05-14-2012, 11:08 PM
yes

http://www.calguns.net/calgunforum/showthread.php?t=461229&highlight=roccobro

ching
05-14-2012, 11:13 PM
Wow. Thanks for the fast reply!

Capybara
05-15-2012, 8:08 AM
Sounds legal to me. Let us know if you figure out a way to actually do this. The higher quality MP5 clones like the Vectors are mostly way over $2,000.00 http://www.atlanticfirearms.com/storeproduct1140.aspx

The Coharie/Bellator/etc. types are about half that price but I would doubt that the quality and reliability is there. http://www.atlanticfirearms.com/storeproduct1026.aspx

Richard Erichsen
05-15-2012, 8:58 AM
Say if i wanted to build an 80% semi-automatic fire "MP5" like how the AR and AK guys are doing.

Will it be legal if:
1) I used a 16" barrel
2) Fixed or adjustable stock no shorter that 30" fully collapsed, over all length.
3) MP5-SD type of barrel shroud
4) 10 round magazine
5) Bullet button type release
6) Semi-automatic only

I'm just curious. seeing how there are MP5 clones in .22lr + homebuild 80% long guns.

Anyone want to share photos of a home-built "MP5"?

80% doesn't really have any meaning with these sorts of builds. In all probability you are going to be folding a flat you get from any of three vendors at a build party (RobertRTG sells three types). You can make an appointment with Roccobro for some random Friday to do your fold and initial weld seam. It will take several hours of work and several visits to build it up.

I'm working on something that will look more like a CETME experiment and borrow from features from the HK MP 54, the prototype for the MP5, replete with walnut ventilated stocks, finned barrel, Cutts type compensator, shortened walnut buttstock and CETME Modelo A style pistol grip on a steel CETME trigger frame.

Now for the individual parts you have in mind for your build:

1) 16" barrel

RCM makes barrels of this type, your source will be HKParts.net. Finding MP5 parts kits with a legal length US barrel (that aren't over $2K) is a real challenge. A typical barrel is going to cost you $160-200.

2) Fixed or adjustable stock no shorter that 30" fully collapsed, over all
length.

The best approach is probably a fixed stock. The fixed synthetic stocks are cheaper than the collapsing stocks or late model folding stocks. I'm an advocate for fixed stocks for all of those reasons.

3) MP5-SD type of barrel shroud

That's going to add some complexity. For a first build, I recommend against it. The triple-frame is totally different (sits on top and is welded on) as are several other parts. If you want to "hide" the 16" barrel, there are ways of doing that will be more cost effective. http://www.hkparts.net/shop/pc/HK94-or-Clone-Original-Vented-Barrel-Shroud-w-Grip-p20.htm. I dislike the integrated vertical handgrip myself, but I understand what it was intended to do. Another option is a fake suppressor can http://www.hkparts.net/shop/pc/9MM-Fake-Suppressor-p888.htm for around $90.

4) 10 round magazine

No problem there, the Bullet Button brand mag locks are steel (Raddlock is plastic, which doesn't give me a warm and fuzzy) and fairly easy to install, especially on a new build. I have trial fitted mine and it did exactly what was advertised.

6) Semi-automatic only

That's a given. All you need for this is either 1) Modify the trigger pack for semi-auto or 2) Buy one already semi-auto for around $120. A G3 trigger pack is cheaper and the only parts that need to be replaced are the ejector lever and a spring. You'll have to decide if you want a "clipped and pinned" trigger frame, or a flush cut type that is clearly hanging off the denial shelf. The receiver is the same in both cases, the trigger frame "hides" the shelf attachment while the flush mount type does not.

R

Richard Erichsen
05-15-2012, 9:08 AM
Sounds legal to me. Let us know if you figure out a way to actually do this. The higher quality MP5 clones like the Vectors are mostly way over $2,000.00 http://www.atlanticfirearms.com/storeproduct1140.aspx

The Coharie/Bellator/etc. types are about half that price but I would doubt that the quality and reliability is there. http://www.atlanticfirearms.com/storeproduct1026.aspx

Always preferable to build your own for a finished weapon well under $4000 (buying a "good" MP5 clone will cost between $2800-3800). The added benefits is that you will know where all the "bodies are buried".

I found the cheapest I could go for a bolt group, probably the single most expensive part, was from Black Market Parts (around $350). RCM makes a similar non-OEM bolt group for around $480. I can't speak to quality for either. Many of the builders on Weaponsguild are modifying G3 and CETME trunnions to build "MP5-SOs" (Sort-Of). They remove the rollers and use the bolt group as a straight blowback arrangement. Given the cost for a full good but used G3 bolt group is about $150, it's an option. Prexis kits for the MP5-SO are also available and have been selling pretty well.

This will be my first (and last) MP5 build. For what they cost I could have built rifles from two G3 kits or three CETME kits.

R