An SRC Gen 2 is about the same as a standard Echo 1 internally. The Gen 3 on the other hand is a whole different animal. Gen 3 internals are absolutely AMAZING. Similar to, but better than G&P and give KWA 2GX a run for their money. The green polycarb piston that comes stock with SRC guns is on par with the several Modify Polycarb's I've owned. I've run mine on an M130 at 20rps and it has very little wear. The bearings are good, the spring guide (aluminum with bearings) does the job perfectly, and the aluminum cylinder head leaves nothing to be desired. The double O-ring piston head is outstanding as well. Combined with the SRC cylinder, it gives PERFECT (no leaks at all) compression.
SRC/TSD used to be crap like any JG (for the most part), but now they are putting out some top of the line performers with their Gen 3 line. Unless you've owned/worked on a Gen 3, don't just spout of what you've heard from old sources.
To the OP: You're looking at a Gen 2, so you will need to do some upgrades just like any other ACM. This is what you should be looking into:
http://ontargetairsoft.com/store/index. ... 0f1974f697
Unfortunately, the SRC G36 metal hopup is still the worst unit ever created.