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rustyb

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I won't mention the brand of AR I have at them as that would only risk pushing my question off topic.

Anyways, I am fairly new to AR's and the rifle I have has given zero problems at all. I am so happy in fact that I have bought another upper with a longer barrel to explore some of the versatility of the AR platform. I have not actually used the new upper yet and when I purchased, it did not have a BCG.

So, the question is, with AR's, should I get another BCG so that a given upper/bcg wear together and mate surfaces like you would with many other mechanical systems or should I just go ahead with the same BCG on both uppers?
 
Your BCG and upper dont have to wear together

You do not need a second BCG "unless you just want to spend more $$$"
 
be careful when mixing bolts and barrels.you may get an unsafe condition caused by excessive headspace.this is caused by an excessive gap between the boltface and the chamber of the rifle.when the firing pin hits the primer,the web,or bottom of the case is unsupported and can fail,sending a blast of high pressure gas and bits of brass everywhere.extreme results can be a totally demolished rifle and severe injury.if you wish to use and mix bolts take the rifle and upper to a gunsmith to check headspace.this is not an ideal situation.you are best advised to purchase a bcg for the upper and have it checked by a qualified gunsmith.chamber pressure in the 223 cartridge runs to well over 50000 cup.
 
barsik said:
be careful when mixing bolts and barrels.you may get an unsafe condition caused by excessive headspace.this is caused by an excessive gap between the boltface and the chamber of the rifle.when the firing pin hits the primer,the web,or bottom of the case is unsupported and can fail,sending a blast of high pressure gas and bits of brass everywhere.extreme results can be a totally demolished rifle and severe injury.if you wish to use and mix bolts take the rifle and upper to a gunsmith to check headspace.this is not an ideal situation.you are best advised to purchase a bcg for the upper and have it checked by a qualified gunsmith.chamber pressure in the 223 cartridge runs to well over 50000 cup.
Click to expand...

always a good idea "just buy a NO-GO 5.56 gauge from brownells" Its easy to check it your self :)
 
I'm not an expert, but I've shot the AR platform since 1988. It used to be my gopher/coyote gun before the laws changed.

I've swapped parts out from rifle to rifle indiscriminately. Zero problems in I'm guessing... 20k rounds.

The people who are warning you of problems likely think you can't shoot 5.56 in .223.

The platform is amazing. Buy parts and swap them. Enjoy.
 
smak_daddy said:
I'm not an expert, but I've shot the AR platform since 1988. It used to be my gopher/coyote gun before the laws changed.

I've swapped parts out from rifle to rifle indiscriminately. Zero problems in I'm guessing... 20k rounds.

The people who are warning you of problems likely think you can't shoot 5.56 in .223.

The platform is amazing. Buy parts and swap them. Enjoy.
Click to expand...
I recall hearing something to the same effect for the AR15 platform specifically. I wish I could remember more though.

That said, it doesn't hurt to have a no go gauge.
 
I would say go for a separate BCG just for convenience sake. However, the AR BCG is designed and intended to be completely interchangable.

If you want to get a shooting it and/or save yourself some cash, swap the BCG between each.

Like Cancer said, a headspace gauge is never a bad idea, but I would not sweat it.
 
You won't have issues with just replacing the barrel.

The headspace is set when the chamber extension is installed onto the barrel at factory. If it was off then, it will be off with every bolt you try.
 
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