AR 15 has a Machine gun Barrel and Bolt?

Perhaps he means a heavy barrel, as well as a FA bolt and carrier?

If so, it's nice that he's telling us about what he's selling, but he'd be well served to use the right terminology...or at least something that doesn't need a secret decoder ring to make sense. :weird:
 
Silly fools, if you have a machine gun barrel you don't need a sear or happy setting to shoot FA.

Geeez.... :dancingbanana:
 
medicstimpy said:
and more heavy duty
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No it's not. The bolt is exactly the same.

The difference between a full and (modern) semi auto bolt carrier is that the sear engagement area on the semi auto carrier is milled out. Semi-Auto bolts used to weigh a good bit less because Colt would cut the entire underside out of them. This topic grew out of these 'half-moon' carriers, and some concern that they might wear the buffer irregularly. This is no longer the case, I don't think anyone manufactures 'half-moon' carriers anymore.

The difference between todays semi and full carriers is 9.26oz vs 9.46oz. There is no functional/strength etc, differences between the two.
 
dangertree said:
No it's not. The bolt is exactly the same.

The difference between a full and (modern) semi auto bolt carrier is that the sear engagement area on the semi auto carrier is milled out. Semi-Auto bolts used to weigh a good bit less because Colt would cut the entire underside out of them. This topic grew out of these 'half-moon' carriers, and some concern that they might wear the buffer irregularly. This is no longer the case, I don't think anyone manufactures 'half-moon' carriers anymore.

The difference between todays semi and full carriers is 9.26oz vs 9.46oz. There is no functional/strength etc, differences between the two.
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I noticed a huge difference between my Semi Auto Colt bolt carrier to my fathers Colt Bolt Carrier found in his Colt HBAR Target. Mines had a lot more material removed.
 
I use the full auto type carriers in my AR's, seems to help them function smoother with less malfuctions. Really helps the most with short barrels or hot loads in full lenght barrels.
 
HeadDamage said:
I use the full auto type carriers in my AR's, seems to help them function smoother with less malfuctions. Really helps the most with short barrels or hot loads in full lenght barrels.
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Nothing wrong with using them, but I still don't feel that the .2oz has much/any effect, particularly when compared to the effect of adding a heavier buffer.

An H buffer adds 4X the weight of the difference between the semi/full carriers , and a H2 buffer adds 8.5X the difference in weight. I find the same effect when shooting short barrels, the added weight seems reduce the felt 'pulse' of the recoil and possibly reliability. I run H2 on my shorties and H on 14.5", probably don't need to, but whatever.

I maintain my belief that the 'want' behind M16 carriers in a semi-auto gun is a leftover of the half-moon Colt carrier days (or too much coolaid.) ;) I can't see a situation where someone wants .2oz more weight than a semi carrier, but less than the .9oz gained with a Heavy buffer. I'd pay the same price for one, but I wouldn't pay more for it (and M16 carriers cost less to make).
 
To be fair, this is how, or at least in the past, Bushmaster advertises their barrels. Note that most shooters will refer to anything that will go FA as "machine guns" , and it is actually acceptable in many places.

For those folks in the military, machine guns mean very specific things.

I don't think there is a need to be overly picky and finding fault in the use of terminology in this case. you know what it is - it is an AR !
 
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