DDLES all the way, (not even close) Very sweet lowers! Got mine in 3-4 days! (if in stock)
To use Glock mags is worth the extra $$, much easier to load and same mags as my pistols for less clutter. (KISS) Lighter mags too and even works with baby clock mags for flush fit.
I did the bolt mod myself without a mill. (I had to try it
)
For those that are "handy",,, just insert a Glock mag and drag the bolt on the left follower to see the line, mark the line down the bolt. Rig up a straight edge in a padded vice, use a router type attachment on a roto tool (or rig something) for a straight line I found the little hard green stones where best and work better at high speed with low pressure, (took 1 1/2 stones) (Make sure you have enough of the same stones as to not change the shape) clean each checking, go until the mag seats and clears bolt movement and leaves no drag marks, polish milled area with a felt wheel and compound . Cold blue and you wont even know it was done. Was quite easy for me and works perfect.
If you are NOT "handy" send it in to be done.