By Raider than the £6 cheaper carbine. It can be done or front end changed but will be more work/cost so buy Raider is best
Yes you could, but a second hand ras might cost around £30? ( someone correct me it's been years since I bought one) and then you would either need to use a limo inside the rail or a battery box on the rail.
So its better to get a raider then? By the way, I cant see myself getting one for a good long time lol.