For those who have been shopping for a suitable upgrade for their A&K ACR's trying to find out exactly which mechbox type they used. The shell is specifically an MP5 Version 2 mechbox, without the right sided guard (which is seen on some AK's) and suspended slot plate. It's also important to note that it's using an M4/M16 selector plate.
You need a longer Nozzle though, which is usually classified, specifically as the Masada Nozzles these days. Earlier before the Masada, was a long AK nozzle for certain brands with middle feeding magazines.
All the internals inside the shell are standard V2 parts, other than the Fire Select gear and Axle. However that's a standard MP5 part. The motor used is a common on M4's Which is the Standard motor "Long type." Rather than the short type, like the MP5.
I hope this clears the air on the A&K - ACR (Masada) and helps others find suitable upgrades for their guns. As those experienced, should see why this gun is so incredible, for finding parts to game with and replace
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Cheers, happy Airsofting.
