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11/24/2017 4:44:23 PM
11/22/2017 10:05:29 PM
Posted: 10/12/2004 6:54:12 AM EST
Since the Ar15 design lends itself to swapping uppers depending on the intended usage of the weapon at any particular time I was wondering if the members who have switched uppers on their AR use the same bolt carrier/bolt in the the uppers they switch on and off or do they use a separate bolt carier and bolt for each upper. There are some prety strong warnings inthe M16 USMC tech manual against swapping bolts & carriers. Since I am considering doing some upper swapping I was curious/concerned about the safety issues
Link Posted: 10/12/2004 7:39:21 AM EST
I have been swapping for 12+ years. I have never had a problem. I use a head space gauge but I don't worry about it. I do it less often now that I am blessed to be able to have a carrier for each different upper. There has to be a reason however for the warnings by the military. I can't say what is right for any one else just that it has worked for me in the past.
pjc
Link Posted: 10/12/2004 8:17:29 AM EST
[Last Edit: 10/12/2004 8:45:54 AM EST by _DR]

Originally Posted By Mustang50:
Since the Ar15 design lends itself to swapping uppers depending on the intended usage of the weapon at any particular time I was wondering if the members who have switched uppers on their AR use the same bolt carrier/bolt in the the uppers they switch on and off or do they use a separate bolt carier and bolt for each upper. There are some prety strong warnings inthe M16 USMC tech manual against swapping bolts & carriers. Since I am considering doing some upper swapping I was curious/concerned about the safety issues



I swap uppers/lowers on occasion, but always keep the bolt groups with their respective uppers.

It's a good practice to at least keep the bolt itself matched to the barrel it has been assembled/headspaced with, the bolt carrier is less important.

Eidted to add: most likely you would be more prone to encounter a problem swapping a bolt/barrel with a large amount of wear/usage on it than a newer bolt/barrell with little wear.
Link Posted: 10/12/2004 8:41:54 AM EST
I swap quite a bit. Have separate bolt carriers for each upper.
Link Posted: 10/12/2004 8:46:24 AM EST
The bolt itself headspaces on the the barrel. You can swap carriers all day long without effecting headspace. The reason the warnings are there is because say one Military rifle has 25K through it and another has 2 rounds through it. If you take the old bolt and put it in the new rifle or vise versa you may have excessive headspace which might Kb the rifle.
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