do you mean the echo 1 m28? if so dont do it, yes it is a nice rifle but the vsr 10 is soo much better!!! you can get an amazing hopup for the vsr 10, but they dont and will not make it for the m28, and it is a little cheaper
try something like this
http://www.evike.com/product_info.php?c ... s_id=28628i have had mine for now 6 years, still shooting wonderful
or you could do a l96? they are also really good for working on. hope this helps