BAT headspace question

[Petey]

Maybe this has been covered before but educate me a little.

I have a BAT MB multi-flat and have owned several barrels that were chambered and threaded by smiths to fit. I understand how they headspace during reaming of that barrel for that action, but here's my question.

How is it that I can take a barrel that was threaded and chambered with proper headspace on another BAT action with the same threads and tpi and ensure the headspace is correct on my gun?

Is BAT's tolerances that good?
The only way I think this would work is if all their actions have the same exact distance from the front of the action to the front of the bolt face. Is this the magic answer?

I never counted threads on all my barrels but I would believe they all would match up.

I guess my question is, if my buddy has a BAT B and he took his barrel off and I screwed it on my BAT MB, how is it possible the headspace is correct?

Sorry if the question seems silly or simple but I has me pondering how things work in your world of gun smithing

 

[fdshuster]

Petey: I can do that with my older Bat SV and the newer one: barrels are interchangable. Also with my Kelbly Panda. I bought one used 6ppc Panda barrel from a guy in Missouri, and another from Maine. They both screw-on my Panda with perfect fit and headspacing.

Write it off as precision machining, something you'll not find in the typical mass-produced factory receiver.

 

[mr45man]

"Write it off as precision machining, something you'll not find in the typical mass-produced factory receiver."

Its amazing that one can screw on a pair of barrels made 3000 miles apart by 2 different smiths and have them headspace perfectly on your action.(If the smith is on top of his game)
Yes Bat machining is that good.
John H.

 

[Phil]

Petey,

Be careful with that MB action.

It has a radius that will cause problems if the barrel is a 1.25" diameter.

Bruce told me that it needs a chamfer, or to be turned down, to clear the radius that is there from machining.

I think the maximum clearence is 1.23"

My smith just put a small chamfer on my barrel to clear and set the proper headspace.

Phil.

 

[Dusty Stevens]

Petey,

Be careful with that MB action.

It has a radius that will cause problems if the barrel is a 1.25" diameter.

Bruce told me that it needs a chamfer, or to be turned down, to clear the radius that is there from machining.

I think the maximum clearence is 1.23"

My smith just put a small chamfer on my barrel to clear and set the proper headspace.

Phil.

Which is why i prefer the 1.200 shanks or make them that way when its in the lathe

 

[Petey]

That's interesting. I'll be sure to Mic this barrel I just acquired before screwing it on then. It was threaded on a BAT B.

Thanks for all the answers.

 

[skeetlee]

I do all mine like dusty says. no worries that way. Lee

 

[Erik Cortina]

Maybe this has been covered before but educate me a little.

I have a BAT MB multi-flat and have owned several barrels that were chambered and threaded by smiths to fit. I understand how they headspace during reaming of that barrel for that action, but here's my question.

How is it that I can take a barrel that was threaded and chambered with proper headspace on another BAT action with the same threads and tpi and ensure the headspace is correct on my gun?

Is BAT's tolerances that good?
The only way I think this would work is if all their actions have the same exact distance from the front of the action to the front of the bolt face. Is this the magic answer?

I never counted threads on all my barrels but I would believe they all would match up.

I guess my question is, if my buddy has a BAT B and he took his barrel off and I screwed it on my BAT MB, how is it possible the headspace is correct?

Sorry if the question seems silly or simple but I has me pondering how things work in your world of gun smithing

Yes, the magic number is the distance from the face of the action to the face of the bolt.

No need to count the threads on your barrels, you will find that they all have one.

 

[Dusty Stevens]

Not only will it screw on and headspace perfectly the writing will even be in the same spot timed perfectly. I have one with a serial number in the low teens and one in the hi 400's and when you swap barrels it looks like it was original on each.

 

[Phil]

No need to count the threads on your barrels, you will find that they all have one.

LOL...............

I never thought about it that way Eric............... ;D

 

[bsumoba]

Is there any issues with 1.25" barrels in a Bat M action then?

 

[Dusty Stevens]

No. I know a 1.450 will go on it but thats just as big as i have gotten. Theres no issue unless it has the shroud over the barrel such as an mb or sb

 

[Petey]

Excellent info by the way! My new barrel was 1.25 at the shoulder, no chamfer (as it came off a B). All my other barrels appear to be turned down to 1.23 for the first inch or so. I'll have to have a chamfer added to this one. Thanks Phil...this slipped right by me

Here's the info on SB & MB - http://www.batmachine.com/wp-content/uploads/2014/06/tenon-1062SBMB.pdf

S, SV, B, DS, 3L, 3LL - http://www.batmachine.com/wp-content/uploads/2014/06/tenon-1062.pdf

M - http://www.batmachine.com/wp-content/uploads/2014/08/tenon-1125-B.pdf

bsumoba... print says it requires a MINIMUM of 1.25 for an M

 

[Phil]

No problem Petey, glad you are getting it done right, be safe and shoot straight.

Phil.