The DD is highly regarded, but this particular DD had a bit of play between the upper and lower receiver. I had to put a bit of electrical tape on the front take-down lug to remove the wobble. There's also a solution involving O-rings, but I didn't want to buy any just yet.
Yep! That's a TLR-1 on the front--I had originally equipped the DD w/ a Aimpoint T-1, but with the TLR1's bezel and the aimpoints 20mm size, my sight picture was really obstructed. If you're going to run a weaponlight at 12 o'clock in front of the A-frame, I'd suggest a Surefire X300--the bezel's smaller.
When I drop in to my BUIS, my sight picture's still a little occluded by the TLR-1. But the Aimpoint M4 with its 30mm size permits me to shoot normally.
---------- Post added at 11:36 AM ---------- Previous post was at 09:57 AM ----------
Here's a good deal on a TLR-1:
Streamlight TLR-1S Tactical Lights
$85 for a TLR-1. Add some spare batteries to get up to $90 for free shipping.