What would be the cheapest way to build a AR-15? Would you just buy a used complete upper and lower? Then put it together your self. Are all upper's and lower's compatible? Or would a self build from the ground up be the best?
The biggest thing to remember is that you HAVE to buy NEW mechanical (the intregal parts on your AR15) parts when building your AR15. Otherwise, you could end up buying some parts that are "like-new" and end up having the rifle malfunction (or not shoot at all) or have it blow up in your face at the range (by the way, that's not a good thing).
No Problem....
Many people don't know about the head spacing in an AR15 (yes, there is headspacing). If you buy a used Bolt Carrier Group (and you don't measure the headspacing) and put it into a new upper, the rifle MAY do one of two things:
1) The rifle may refuse to cycle properly due to the gap created by the worn bolt (the gasses seeping out of the chamber through the worn bolt and the locking pins),
2) The rifle may blow up in your face (again, due to the gap created by the worn bolt between the bolt and the chamber)
Can you shoot a used BCG in a new gun and it work flawlessly? Sure.
Can you shoot a used BCG in a new gun and it blow up in your face? Sure.
If you're going to buy a BCG for your rifle go ahead and buy a high end, good quality BCG. That's all I'm saying.
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