I highly doubt that you will find upgrades for them, but i had a WG MK23 and i loved it, but you have to use .25g BBs with it, because the hopup is fixed and set for that, great guns though, powerful, accurate, reliable, and CHEAP
Words to live by
Originally Posted by Kid
The apartment I am in right now costs $100 a month.
My average spending on food per day is less than $4.
My airsoft spending in the last month and a half has totaled over $1400.
They're called priorities. Get yourself some.