I've been a Colt user for a long time (35 years) but now I have both Colt AR6721 and LMT Defender 2000 16" with LMT M16 BCG.
The slight differences I have noticed are the LMT barrel is not parked under the FSB and doesn't use taper pins for the FSB.
Colt LE6920 have double layer heat shields in the handguards, LMT have only one layer.
The LMT lower has a high shelf and small diameter FCG pins while the Colt have an unmachined web sear block and large FCG pins.
LMT's buffer tube is grey dry lube 5 position with three drain holes in the last rear most detent holes, Colt's are 4 position anodized.
So far I had my LMT for more than a year now and have no problems with it like my Colt, I would recommend it if you can't find a Colt.
There should be a big shipment of 6920 to Colt dealers either next month or so.
YMMV
AR-15 SP1 owner since 1971
NRA and CRPA life member
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