j_h_smith
Ultimate Member
- Jul 28, 2007
- 28,516
Man did this thread go off the rails or what ??
Lets just say this thread is no longer Mil-Spec.
Auto bolt carrier
- Thread starter toddtrain
- Start date
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Lets just say this thread is no longer Mil-Spec.
BUFF7MM
☠Buff➐㎣☠
That perticular model will only work for you if you use the Chris Costa method of driving it into battery with the charging handle.
- Jul 29, 2014
- 49,995
I feel deeply wronged by your callus opinions!
Ditto.
I have a couple of NiB BCG's, in my experience they aren't any better than a regular phosphated BCG, but they aren't the evil empire either. Melonited BCG's are becoming more widely available and that's mainly what I'll be using in the future.
dist1646
Ultimate Member
The problem with coatings is that they can vary in thickness. That variation can cause headspace issues. NiB for example, can vary up to .006" which is more than enough to cause headspace problems.
And that's why chrome lined barrels tend to be less accurate. FWIW, Melonite isn't a coating, so there are no issues with potentially uneven thickness to be concerned about.
- Jul 29, 2014
- 49,995
clandestine
AR-15 Savant
NiB is inferior to a Phosphate coated, chrome lined Carrier. The Carrier Bore is less wear resistant then a chrome lined one and if not lubed, the gas rings can seize up.
Melonite Bolts are more brittle. There is no improvement. They chip or break faster around the cam pin area
clandestine
AR-15 Savant
Melonite is cheaper to apply than chrome lining. Ever notice how many budget barrels now are melonited?
If the barrel extension is treated along with the barrel, the torque value between the 2 parts can change. Corrosion can also happen. Melonite Barrel Extensions tend to chip at the feed ramps because they are too brittle.
There are few companies who melonite AR barrels properly. Faxon is a good one.
- Feb 4, 2013
- 28,175
clandestine
AR-15 Savant
Im certain the bolt is what he meant. He is a very knowedged fella.
Im certain that is the reason I am seeing headspace issues with NiB Bolts.
- Feb 4, 2013
- 28,175
OK. Just checking.
smokey
2A TEACHER
- Jan 31, 2008
- 31,508
Here's the difference in carriers. Notice the tail has more material and is heavier on the m16(full auto) bolt carrier. The weight can help with reliability, as it has more mass slamming forward to push a cartridge in the chamber and lockup the bolt. More reciprocating mass can lead to more recoil though, so many competition carriers will have material stripped away from them like this one...but they can be more finicky depending on how they're set up.
If changing the carrier to an m16 style causes your buddy's gun to run wonky, it's likely due to issues with gas/buffer/springs not being setup right. In a properly set-up AR, a m16 carrier will work just fine, as it's what the gun was designed around. The other carriers, like the colt sp1 came about from retarded legislators coming after the lightning link and other fun things. Colt reshaped the carrier so some of the full-auto parts wouldn't work with it.
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