Nope, no relation to Quentin Defense and don't own one. Just found the picture online. Used to live in Gilbert, AZ though and last year when I was there was tempted to buy a QD-15.
Nice Chatterbox, mjkeat!
Colt LE 6920
Colt Match Target
Colt Armalite AR15 (pre-M16)
Interesting that none of those Colt's appear to have the proprietary larger size pins ( .171" or .172" something like that ). Must be newer editions, huh?
FN FNX-01 civilian issue lower receiver (rare)