SanJoseScott
US Veteran
"Not available for sale in California"....yawn
Nice thing about Colt's LE901 is that the adapter makes it accept any mil-spec .223/5.56 upper though, meaning it would also accept the .300 blk/whisper. Stacking tolerances could become an issue, but none of the reviews I've read point to any problems.
Dik, colt has this thing about front pin sizes..I would make sure that the pin size would allow for any upper and not just a Colt!