That's not a bad price for either the 9mm or the .45 (which is it?) I took the factory grips off as well and mounted black alumagrips. I actually like the factory grips but not on the black gun.
If you can pick that up FTF, than the price is definitely right.
$1300 is not a steal but a very good price. IF you want to beat it, you might wait a long time as guardians don't come up for sale often and they are usually around $1450-1600 on GB. The better deals are rarer still.