[yuhaoyang]

If you really do want a bolt catch and recoil, you can look into getting a retailer to import you a TM sopmod, this with the mags has a chance of running over $1000. There are some new EBB CAs that will have a bolt catch, although most blowback mechanisms on AEGs are for mostly cosmetic purposes. Some newer AEGs I think do have bolt catches, but they are pretty rare, I think AATV reviewed some. Anyways, for $1000, any AEG M4 under a systema will be avalible to you. It isn't really nessesary to have a functional bolt catch on an AEG though, because it serves no purpose at all except to make the hop-up wheel easier to access. Consider a proline CA M15A4 carbine, or one of the G&P guns.