Well, would have to disagree with all of you. From what I understand the lower is made of better aluminum that will stand up longer over the years.
I agree with the above statement, however the weapon is stressed when "operating" it. I look at weapons a bit different than some, their is a difference between shooting and operating a weapon system. Anyone that has been in the military or has been to modern weapons training will understand. I would say 99% of the time the normal "shooter" would never need a receiver like this, however if you train with your weapons, and again training is not just shooting, then you might make the decision to pay the extra bit of money to get the upgraded receiver. A weapon is some cases is used as a leverage tool when you are running and have to go to prone to engage a target, it is also used as a tool when getting up from prone to move to contact or away from contact and these actions will put stress on your lower receiver. The weapon can be used as a weapon without firing it, a good strike to the head of your opponent will put stress on the weapon. When exiting a vehicle under contact you might smack your barrel on the door jam, this will put stress on your lower receiver. So if your a shooter and collector it probably is not worth the extra money, but if you train with your weapons then it might be something you want to consider.The lower is subjected to virtually no stress upon firing...
I agree with the above statement, however the weapon is stressed when "operating" it. I look at weapons a bit different than some, their is a difference between shooting and operating a weapon system. Anyone that has been in the military or has been to modern weapons training will understand. I would say 99% of the time the normal "shooter" would never need a receiver like this, however if you train with your weapons, and again training is not just shooting, then you might make the decision to pay the extra bit of money to get the upgraded receiver. A weapon is some cases is used as a leverage tool when you are running and have to go to prone to engage a target, it is also used as a tool when getting up from prone to move to contact or away from contact and these actions will put stress on your lower receiver. The weapon can be used as a weapon without firing it, a good strike to the head of your opponent will put stress on the weapon. When exiting a vehicle under contact you might smack your barrel on the door jam, this will put stress on your lower receiver. So if your a shooter and collector it probably is not worth the extra money, but if you train with your weapons then it might be something you want to consider.