Cyma AK47 review -- bullshit

I saw a review of Cyma's CM028 - AK47 replica. And I thought I must write here something, because the review is bullshit. But what to expect when the replica is reviewed by someone who sells them, not by someone who only uses replicas!

Around 2:12 the guy says the following:

Not only will bigger and more powerful battery increase the rate of fire (...), also increase the range and accuracy up to 5 to 10 per cent.

Come on! The only thing that changes when you supply 9.6 volt current instead of 8.4 volt is the engine speed. The engine revolves faster, the gears in gearbox revolve faster, the power spring gets compressed faster. But the energy delivered to the piston by the spring does not depend on how fast the spring was compressed! So no matter what battery you use, the amount of compressed air that will push the BB through the inner barrel remains the same.

Well... there may be one case when it isn't the same. If you connect 12V battery to stock replica, the engine may try to compress the spring when it didn't decompress itself fully. The engine may revolve so fast that the next gearbox work cycle will start before the piston reaches the cylinder head.

mG36 at home, but broken

Recently, when I used the phrase "my favorite ASG shop" I meant the asgshop.pl. It changes today! They aren't my favorite airsoft reseller anymore, 'cause they screwed up my replicas twice. The AUG was first (the guy who repaired the replica didn't replace the broken engine) and now the G36 is broken...

And what's the most hilarious in this whole story? I think I know what is the problem as I almost forseen it...

Two years ago I tried to replace the inner barrel for my G36. At that moment it was difficult to purchase a proper barrel since it wasn't available at any of local airsoft shops. So I bought some 509mm-long barrel for AUG and M15s. But I couldn't install it, as it had notches in wrong places. The notches are used to hold the barrel to the hop-up chamber.

When I unpacked the replica from the box, I found a small piece of hop-up assembly. This part - spacer - stopped me from installing the barrel when I tried it. On this photo you can see when this spacer goes on the barrel, it is the place where the notches are. I the notches are somewhere else, you can't install the spacer. And the spacer is very important as it: holds the barrel from sliping out of the hop-up chamber and holds the hop-up adjusting wheel from moving to the front.

Okay, so I took the mG36, plugged charged battery and then tried to fire the replica. It made some noise, as the gearbox worked. But the BB wasn't shot. The BB wasn't fed to the hop-up chamber and wasn't shot. I rotated the replica upside down to make sure there is no trouble with the high capacity magazine. Nothing changed. So I thought maybe the hop-up is set on high BBs turning and then I turned the adjusting wheel to the other side. Nothing changed, but the adjusting wheel moved a bit to the front of the replica.

As the mG36 doesn't work, it's going back to asgshop.pl for further repairs.

mG36 is ready

On thursday a guy from my favorite airsoft shop called me and we spoke for a while about my mG36 replica I sent for repairs and tuning.

He said that he installed the parts I asked for (precise inner barrel, 6.04 mm by Systema, and sealed air nozzle) and tested the replica on the chronograph. I wanted the replica to have around 350 fps -- enough for playing with guys that have 400 fps installed, but not very much). And I thought that after this barrel and nozzle installed it’ll have something close to that (330...340 fps maybe), since the G36 from Classic Army has 315 fps in stock!

Do you want to know what were the results from chronograph? A shitty 290 fps! I was stunned when I heard that.

It seemed that there was no other choice than to change the power spring. I asked the guy what caused such poor results. He said that the cylinder - cylinder head - piston head set is not very airtight and the spring looks weak. He suggested to change the spring go M100 and new cylinder with both heads made from aluminum. When I approved those parts to be installed, he asked me if I didn’t want to have the M110 instead as it’ll give me something close to 400 fps. Of course I agreed...

On friday he called me again. He installed the M110 and the other parts I mentioned above. He checked the replica on chronograph again and had result of 390 fps. That’s more than enough, I think...

Would you guess how much I’ll be charged for this tuning? PLN 460, amount equivalent to $170.

But hey, if the mG36 is supposed to be an light support weapon (as it’s real steel MG36 counterpart), it must have better range and accuracy than typical ASG replica...

the mG36 sent for tuning

Today I sent my mG36 replica. I must say it was a struggle to pack it in some cardboard box, 'cause I didn't have box that was big enough to fit the entire replica, even with folded stock. So I used two smaller boxes and taped them together, then taped them both around, wrapped in paper and taped again. ;) It weighed 5 kilograms as I was told at my post office.

I will keep you updated with mG36's tuning news.