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Author Topic: Various Uppers that fit which Lowers?  (Read 2006 times)

Offline Alchase

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Various Uppers that fit which Lowers?
« on: February 03, 2017, 12:21:38 PM »
Is there a "comprehensive list" of Uppers and which Lowers they will go with?
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Offline jasnt

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Re: Various Uppers that fit which Lowers?
« Reply #1 on: February 03, 2017, 12:56:43 PM »
I always thought any upper would mount on any lower as long as they are both ar15 :dunno:
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Offline snowshoes22

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Re: Various Uppers that fit which Lowers?
« Reply #2 on: February 03, 2017, 01:07:00 PM »
I believe some colt lowers had different size pin holes so they couldn't accept m16 parts. I think it is mostly an older colt thing
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Offline Alchase

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Re: Various Uppers that fit which Lowers?
« Reply #3 on: February 03, 2017, 03:59:13 PM »
I believe some colt lowers had different size pin holes so they couldn't accept m16 parts. I think it is mostly an older colt thing

I had heard that myself
I believe some colt lowers had different size pin holes so they couldn't accept m16 parts. I think it is mostly an older colt thing

Don't M4s have the same issue?
Only 2 defining forces sacrificed themselves for you:
The American Soldier and Jesus Christ. One died for your freedom, the other for your soul.

My rock,
He trains my hands for war and my fingers for battle.
Psalm 144.1

Offline jbauch357

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Re: Various Uppers that fit which Lowers?
« Reply #4 on: February 04, 2017, 11:17:18 AM »
The large/small pin variants should only effect the parts you can put into the lower, most aftermarket parts manufacturers sell mil spec and large pin variants of fire control group parts so you can still get almost anything you want.  To be safe if you don't want to deal with it, just make sure you get a standard mil spec lower.

Offline 724wd

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Re: Various Uppers that fit which Lowers?
« Reply #5 on: February 04, 2017, 08:40:42 PM »
I've got a large pin colt HBar upper on a small pin DPMS lower.  Using an offset bushing.  It's a bit hinkey, but I was ringing the 400 yard gong at fernan with issue carry handle sights. 

 


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