Bolt Carriers

Pinecone · Aug 14, 2014

Oh, and if I replace the BCGs with the unshrouded firing pin, swap th bolt over to use the same bolt in the same upper?

I know they SHOULD headspace OK, but until I spring for some gauges, it seems prudent to swap the bolts.

BradMacc82 · Aug 14, 2014

This is a notched hammer -

View attachment 126926

Only beneficial if you have a fun switch in the receiver, otherwise dump it.

Headspace is set on the relation of the bolt itself and the barrel/barrel extension. Just swapping the bolt over to a new carrier is fine, won't change headspace as long as you put the original bolt back in.

ThawMyTongue · Aug 14, 2014

I thought this (right) was a notched hammer:

And Brad's pic above was a burst (M16) hammer.

BradMacc82 · Aug 14, 2014

Hmm, maybe we're both right??

Although it wouldn't be the first or last time I've been wrong...

clandestine · Aug 14, 2014

ThawMyTongue said:
I thought this (right) was a notched hammer:

As far as my reference that is correct. The one on the right is notched. Some aftermarket ones are notched there too and they all suck in my experience.

You want something rounded like the one on the left, the one pinecone posted, or the one Bradmacc posted (have to remove the auto sear hook on the rear for semi auto guns though because unmodified M16 fire control parts are ano-no on a title 1 weapon without a rdias).

ThawMyTongue · Aug 14, 2014

BradMacc82 said:
Hmm, maybe we're both right??

Although it wouldn't be the first or last time I've been wrong...

LOL, there are some subjects I am certain on... When it comes to firearms, I KNOW I'm still learning.

clandestine · Aug 14, 2014

Correct. Changing a Carrier should not change head space on an AR. Swapping the bolt head changes headspace.

Everyone should have headspace gauges for their blasters. AR headspace does go bad and the gauge will tell you. A field gauge will tell you if its unsafe. You do have to remove the ejector and extractor to get a proper read though.

When you swap Bolt heads or barrels, always check headspace.

BradMacc82 · Aug 14, 2014

ThawMyTongue said:
LOL, there are some subjects I am certain on... When it comes to firearms, I KNOW I'm still learning.

Any time I think I know something, is usually when it's proven that I don't know as much as thought.

ThawMyTongue · Aug 14, 2014

clandestine said:
Correct. Changing a Carrier should not change head space on an AR. Swapping the bolt head changes headspace.

Everyone should have headspace gauges for their blasters. AR headspace does go bad and the gauge will tell you. A field gauge will tell you if its unsafe. You do have to remove the ejector and extractor to get a proper read though.

When you swap Bolt heads or barrels, always check headspace.

I have 'go' and 'no go' gauges for 5.56, do I need to pick up a field gauge as well?

clandestine · Aug 14, 2014

ThawMyTongue said:
I have 'go' and 'no go' gauges for 5.56, do I need to pick up a field gauge as well?

Not really. If you ever have one eat a no-go then you can invest in a field. If it doesn't eat a no-go then you'll never need a field.

ThawMyTongue · Aug 14, 2014

clandestine said:
Not really. If you ever have one eat a no-go then you can invest in a field. If it doesn't eat a no-go then you'll never need a field.

Thanks!

Pinecone · Aug 14, 2014

OK, so the "notch" is at the point of the hammer that rides on the bold carrier. I have not seen one like that. Or at least did not notice it. I will have to check the ones I have removed.

EDIT------- Checked, and the stock Colt hammers (removed for Geisseles) are notched. But currently, none of mine have notched hammers. Just neutered bolt carriers.

Here is a little bit better picture, the one marked AR-15 is the notched version:

rico903 · Aug 16, 2014

Pinecone said:
You have one neutered one and one AR type.

Thanks very much for the pics. I have 1,3 &4 in the picture.

Pinecone · Aug 16, 2014

BTW, the picture is not complete. There is also the Colt neutered with the unshrouded firing pin. A combination of #2 (unshrouded firing pin) and #4 (neutered back end).

clandestine · Aug 16, 2014

Pinecone said:
BTW, the picture is not complete. There is also the Colt neutered with the unshrouded firing pin. A combination of #2 (unshrouded firing pin) and #4 (neutered back end).

You are correct. :thumbsup:

Magnumite · Aug 16, 2014

FWIW, I have a sear block Colt receiver and there is no interference when using a standard AR-15 carrier. It is not, as noted, compatible with the M-16 carrier.

Pinecone · Aug 16, 2014

Hmm, supposedly should not work. But if it does, great.

I had Specialized Armament mill the top and front part off the sear bloclk. Also machine and installed normal front pivot pin.

I should have it back middle of this coming week, I will post pics and experiences.

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