Reddit reviews DEWALT DCF886B 20V XR Lithium Ion Brushless 1/4-Inch Impact Driver, Battery sold separately
We found 2 Reddit comments about DEWALT DCF886B 20V XR Lithium Ion Brushless 1/4-Inch Impact Driver, Battery sold separately. Here are the top ones, ranked by their Reddit score.
DEWALT brushless motor for up to 57% more run time than brushedCompact and lightweight for tight areasThree LED lights with a 20 second delay after trigger releaseOne-handed loading 1/4-inch hex chuck accepts 1" bit tips
Both of those screw guns are for drywall. Those aren't the best choice for building a fence, or really anything except drywall. It might work, but it's going to make it more difficult. Any chance you can return those tools and pick up an impact driver like THIS?
As far as screw lengths, if you're planning on toenailing the screws, you could probably get away with 2" screws, but longer will be better. I would use 1-1/2" for the pickets.
Instead of toenailing the 2x to the 4x, you might have better luck with a bracket like THIS. You could also use shorter screws that way, so your tools might work better.
The new 20v li-ions might change your mind about batteries. I have a 20v li-ion brushless impact. It is amazing, and being an impact it is easy to stop at a certain depth plus you don't need to mess with chucks to switch bits, it pops in and out easily.