Originally Posted by MichaelBarton
if i buy a striped lower, can i keep all the arts that are on my current bush master lower? i want to get a metal lower, not carbon
Actually, yes you can. My buddy has a Carbon 15 and the lower uses a standard LPK. He wasn't happy with the trigger so we replaced the trigger/hammer group with no issues other than the safety lever and trigger were a very snug fit but I've seen that on metal lowers too.
And the C15 upper operates correctly on a milspec lower, so yes you can do this. If you're saying you want to pull the LPK out of the C15 lower to install in a standard lower, yes you can but I'd recommend buying another LPK since you're liable to crack the C15 lower driving out the bolt hold open roll pin.
And you could remove the receiver extension and screw it into the metal lower but Bushmaster loctites it and the castle nut in tight as a drum so again you could crack the receiver trying to unscrew the tube.