Faxon Q&A #4: Chamber types, heat dissipation, headspace and more! (Patreon)

http://faxonfirearms.com/

Part 4 of ongoing our barrel discussions with Faxon.  In this one we discuss chamber types, heat dissipation, headspace and quite a bit more as well.

00:41

What’s the difference with chamber cuts?  223, 556 NATO, match, Wylde, etc.

What are all these things and are they relevant and why?

06:37

Commentary: For most real world and practical applications, match grade and tight chambers aren’t worth the trouble.

08:51

Discussion about what tight versus loose chamber cuts actually even mean in terms of dimensions.

Radial and dimension differences between .223 and 5.56 NATO.

10:44

What does it take to get to “subMOA”?  

12:53

The gun design itself is important when attempting to get to “subMOA”.  Some designs lend themselves towards accuracy more than others.

18:38

What is the difference between a true match and a “subMOA” barrel?

 21:16

The definition of  what a “match” is has changed over time and therefore the requirements for what you need to shoot a match have changed as well.

25:00

What is the difference between lapping and honing?

30:25

What is headspace and how is it measured?

40:04

Some guns have adjustable headspace. 

What can happen when headspace is outside of safe boundaries?

42:41

What can be done to mitigate headspace problems?

 45:00

Thermal dissipation - weight versus function?

Pencil barrels aren’t intended for sustained high ROF, but that wasn’t the goal.

Barrels designed for sustained rates of fire are heavier & thicker - it’s all a compromise.

49:14

The BAR & the Chauchat had overheating issues because of barrel design.

The M16 was not designed to be a SAW.

 51:00

The full auto switch on an M16 can’t be used as a panic button which then can result in overheat and total failure.   This doesn’t mean we shouldn’t have full auto, but it has a specific purpose.

52:59

Fitting extensions to receivers and what is the accuracy effect in doing so?

55:28

The AR15’s locking recesses are part of the barrel assembly, not the upper receiver.  This is different than many other designs.