The sky is the limit. It all depends on why u want to. Is there sumthing u would like to do or something that u can't find to fit exactly what u want already on sale? If it's just to have a go. It would be cheaper to buy a broken m4 and see if you can fix it. This will give u a good idea of what u are and are not capable of doing. Also it's someone to try out ideas before u filled with a working gun that soon become a f@cked gun.
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