In my humble opinions the only way to be sure is to buy two exactly matching units.
And the other opinion, I have owned four different AR rifles, One of them that I currently have has over four thousand rounds through it. Never had a jamb or a miss fire, this rifle was purchased in 2003 and I use it as a hunting rifle and drag it around with dirt and dust on it.
I recently seen a test in a prominent gun magazine where they took several brand new AR rifles and ran 10,000 rounds each through them in a couple of days and recorded how many failure to feed and how many misfires etc and then tore them down and bore scoped them to see what was the best and worst ammo.
In the entire run with multiple rifles and several ammo types there were only a couple duds and three or so failure to feeds, out of many thousands of rounds total.
Tulla was worst Silver Bear was second worst, and federal something was best as defined by internal throat barrel wear.
My point is, If you clean your AR and it is of reasonable mid range quality. You will not wear it out in your life time. You are kinda being silly if you think you need to keep a bunch of backup parts.
You likely will not be able to afford the ammo necessary to wear out a part in a newer high quality AR.
This is why they in my opinion are the ultimate fire arm.
And the other opinion, I have owned four different AR rifles, One of them that I currently have has over four thousand rounds through it. Never had a jamb or a miss fire, this rifle was purchased in 2003 and I use it as a hunting rifle and drag it around with dirt and dust on it.
I recently seen a test in a prominent gun magazine where they took several brand new AR rifles and ran 10,000 rounds each through them in a couple of days and recorded how many failure to feed and how many misfires etc and then tore them down and bore scoped them to see what was the best and worst ammo.
In the entire run with multiple rifles and several ammo types there were only a couple duds and three or so failure to feeds, out of many thousands of rounds total.
Tulla was worst Silver Bear was second worst, and federal something was best as defined by internal throat barrel wear.
My point is, If you clean your AR and it is of reasonable mid range quality. You will not wear it out in your life time. You are kinda being silly if you think you need to keep a bunch of backup parts.
You likely will not be able to afford the ammo necessary to wear out a part in a newer high quality AR.
This is why they in my opinion are the ultimate fire arm.
