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After learning about the GSG-5, GSG-522, H&K MP5 A5 .22 LR, H&K MP5 SD .22 LR, etc., which are MP5 replicas chambered for .22 long rifle rounds, I started thinking about the Cyma CM023 MP5 airsoft gun. The Cyma CM023 could be an excellent close-quarter training weapon for the real thing. But in stock condition, it's really not all that useful. But maybe a bit of make-over and modification, using other airsoft spare parts you have, it can be formidable.
First thing is to upgrade the battery. The stock 350 mAh battery has too little capacity to be useful. And the proprietary connector doesn't help either. I have a 8.4v and a 9.6v battery I like to fit in it. See the three different batteries below.
Attached Image: 
IMG_20130816_013104.jpg
Jake
Fri, 16 Aug 2013 22:19:43 +0400
The 7.2 mini battery fits just right into the battery holder within the CM023 handguard (see photo below). But the battery holder is too small for the small type batteries that I want to use.
Attached Image: 
IMG_20130816_013333.jpg
Jake
Fri, 16 Aug 2013 22:23:58 +0400
The small type 8.4v battery pack will fit into the handguard. But the battery holder will have to be cut away. It seems promising. If I can get it to fit, then I would have 1600 mAh to train all day, while having increased rate of fire (ROF) with higher voltage.
Attached Image: 
IMG_20130816_013438.jpg
Jake
Fri, 16 Aug 2013 22:27:41 +0400
Small type 9.6v battery pack will just barely fit into the handguard. It is going to be iffy. Maybe its pushing it.
Attached Image: 
IMG_20130816_013548.jpg
Jake
Fri, 16 Aug 2013 22:30:08 +0400
A hobby saw (see photo below) should be able to remove the battery holder quite easily.
Attached Image: 
IMG_20130816_225211.jpg
Jake
Tue, 20 Aug 2013 01:10:59 +0400
Yup. It was really easy. Only took five minutes to cut away the ABS plastic (see photo below). However, it seems that the small type 8.4v and 9.6v batteries are too big to fit into the handguard.
There is still a good chance that the small type 7.2v battery will fit. Unfortunately, I don't have one of those batteries to try. So this project will be on hold for a while.
The only other solution is to mount the battery on the outside of the gun.
Attached Image: 
IMG_20130816_225621.jpg
Jake
Tue, 20 Aug 2013 01:13:30 +0400
I have now completed this project. Except I have no intention of getting a 7.2v battery for this gun nor for any other airsoft gun. Therefore, the only option for me is to mount the battery to the outside of the gun.
First, I had to add some rails to the MP5. That wasn't very hard and the MP5 became far more versatile.
Next, I got a D-Boys BI-09 PEQ-2 Battery Box. This is a replica of the AN/PEQ-2 night vision IR laser emitter used by the U.S. military. Eventually, I will added real laser to it, but for now, it will just be a battery box.
I like the battery box on the right side of the MP5 (see photo above). But it doesn't work too well with the hi-cap magazine (see photo below). The combination will work. But the force, over time, will damage the plastic parts.
Attached Image: 
IMG_20130911_230338.jpg
Jake
Thu, 12 Sep 2013 14:14:05 +0400
So I moved the PEQ-2 box to the other side of the gun. On the real MP5, it is not possible to put the PEQ-2 in that position because of the cock handle. But if you are willing to sacrifice some realism, the PEQ-2 works well on the left side (see photo below).
Attached Image: 
IMG_20130911_231630.jpg
Jake
Thu, 12 Sep 2013 14:23:20 +0400
The following photo shows what the MP5 looks like with the PEQ-2 on the left side. Because of the cocking handle, the PEQ-2 has to mount further back. The cocking handle can't be utilized, but it serves no purpose on this airsoft gun anyway. The size of the PEQ-2 and its mounted lpcation may block big hands.
I mounted the PEQ-2 just behind the cocking handle. It is very close, so now it is difficult to release the handguard. It was not the most desirable location, but it worked overall.
Attached Image: 
IMG_20130911_231746.jpg
Jake
Thu, 12 Sep 2013 21:51:03 +0400
This battery upgrade mod worked very well. The night after I made this mod, we went to the Insight Interactive Sports Arena (an indoor CQB field). I brought this gun as a spare in case my primary AEG broke. Turned out my friend's JG G36C won't feed BB's from the start, so I lent him this Cyma CM023 MP5 spare. He used the MP5 all night long with a 8.4v 1600 mAh battery in the PEQ-2 box. And he was quite formidable on the field.
He wouldn't have been able to use it all night if we had use the stock 7.2v 350 mAH battery. It would have ran out of juice in half and hour to an hour.
Jake
Sat, 14 Sep 2013 00:34:18 +0400
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