CA is a decent brand. I've owned one myself and it's pretty good. Some upgrades would make it even better. I wouldn't get western arms m4 though because i've heard many problems with it. These include the hopup, the bolt face,bolt catch(metal but will wear out fast), stock tube etc. All of those will need to be replaced to make it reliable(will cost a fortune) and it is mostly made of plastic. I would recommend a couple brands to you such as KWA, G&P, TM,or CA. personally, i would go with G&P because it's got very high quality internals and externals. KWA is good too(lipo ready although i would not recommend using it) but IMO i don't really like the overall look of the gun(colour, trades), and TM has great performance even with stock internals. There's a ton of after market parts for it. I own a TM m4 and i've upgraded the externals to it(just click my sig) I'm currently upgrading the internals to increase the FPS but so far no problems with it. Hope this helps
