This is the airsoft gun I used for the mods
notice the grip in the picture is a pump grip, if you remove it and the cover behind it, you will reviel the mp5 Handguard I used on my A-5.
See the galleries for complete instructions for the handguard and Sliding Stock from this kit.
Total cost for airsoft gun (what I paid) 39.99
Basically you pay only 20 bucks for a handguard and 20 bucks for the sliding stock.