1. I have the M15A4 rifle, and it's a dream to shoot. It's solid, has quality internals and externals. No problems to report here whatsoever. It's my favorite gun in my collection by far. Some people say the compression parts tend to be sub-par, but I fired about 20 000 rounds through mine stock, and when I did open the mechbox to finally upgrade the spring and the compression parts (which I expected by what I heard to be worn out), there wasn't any wear on anything. I installed my new spring guide, piston, piston head, and cylinder hear nonetheless, but none were really needed.
2. Armalites are the most upgradeable guns you can get bar none. All internals and externals are TM compatible, so if it fits on an Armalite or in a V2 mechbox, you can use it with this gun.
3. It's a workhorse and a top performer in my book. With the upgraded spring (Prometheus MS110SP - about 360 fps) it outranged every other gun on the field at my last game. Add a tightbore and new hopup rubber to the stock gun and you'll have an accurate gun that can reach out and touch someone easily at 150 foot ranges. I can't see myself wanting another M16 model as long as this one holds out for me. And if something happened to it, chances are I'd buy another CA to replace it.
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