lrn2AR15. The lower receiver on an AR-15 is not actually subjected to heat or pressure other than vibration and a user using a magwell hold. It also happens to be the only part of an AR-15 that is considered a firearm.
lrn2AR15. The lower receiver on an AR-15 is not actually subjected to heat or pressure other than vibration and a user using a magwell hold. It also happens to be the only part of an AR-15 that is considered a firearm.