Colt OEM1 question

[Stickman]

On the subject of Colt Receiver Extensions, what is the best method to remove a factory installed Colt RE? I would like to change out the factory 4 position for a 6 position but in the past have damaged the Colt 4 position during the removal. I've used a magwell block with a Brownells RE wrench (very sturdy/well designed wrench). Hitting the wrench with a deadblow hammer. This method has never broken the factory Colt staking and instead the whole receiver extension and endplate turn out of the lower. Luckily it's only damaged the RE and not the lower. Is a better method to clamp the RE in the vice? I know some of you guys (Grant) has done this many times with no damage to any parts. Any advice is appreciated.

Just turn the wrench and stop using a hammer. Get leverage if you need to, though you shouldn't need much. The staking is undone pretty easy.

[DG23]

Is it possible someone reclassified their "Expanse" lower as an "OEM" lower?

No ambi safety on any Expanse I have ever seen or any that I own.