Don't do it.
Get some DPM or Flecktarn (an old shirt will do)
Cut roughly to size and attach with elastic bands. (Your friendly postie will provide the bands for free.... usually by the bushes in front of your doorstep)
I've seen an AAS400K ruined by sticky camo tape.....horrible.
Has the added advantage of being easy to remove to clean and for when you want it to look llike a proper sporter instaed of a military sniper clone too.
I'll post a pic of my AA410K when I get home later tonight.