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Old 01-13-2010, 07:35 AM   #1 (permalink)
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.22lr Chamber Dimensions

I have a cut M16 barrel (muzzle end). I want to make a .22lr chamber on the cut side (for rimfire). I have about 10" of good barrel left. What're the dims for the chamber? Super stoopid tolerences on this? Is there a .22lr chamber reaming tool i can use? Need I a lathe??

Yes, pondering homebuild ideas here.....thanks!!
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Old 01-13-2010, 07:58 AM   #2 (permalink)
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22 rimfire and 22 centerfire have different barrel dimensions I believe it is .221 vs .224.


That being said here are some reamers.

http://www.brownells.com/.aspx/sid=1..._Rifle_Rougher

http://www.brownells.com/.aspx/sid=1...Rifle_Finisher

Not too sure you need both but I would say a lathe would be favorable.
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Old 01-13-2010, 08:03 AM   #3 (permalink)
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22 rimfire and 22 centerfire have different barrel dimensions I believe it is .221 vs .224.
Edited post...yes, this is for rimfire...
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Old 01-13-2010, 09:14 AM   #4 (permalink)
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Do you "need" a lathe? No, but it is definately the right tool for the job. What else did you have in mind, drill press?
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Old 01-13-2010, 09:22 AM   #5 (permalink)
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drill press?
ya...why?


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Old 01-13-2010, 09:27 AM   #6 (permalink)
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Edited post...yes, this is for rimfire...
I knew that from the 22lr in your post lol, what I am saying is that the inside diameter of the barrels are different.
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Old 01-13-2010, 09:31 AM   #7 (permalink)
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I knew that from the 22lr in your post lol, what I am saying is that the inside diameter of the barrels are different.
It's a "demilled" or whatever Colt M16A1 barrel (Saw cut). Does the ID you refer to matter? No different than a .22lr kit shooting through an AR right?

I think I'm the confused one here

I'm wanting to make a .22lr gun out of this barrel section and some other crap in the parts drawers....maybe a single shot, break action. Not sure though.
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Old 01-13-2010, 09:42 AM   #8 (permalink)
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It's a "demilled" or whatever Colt M16A1 barrel (Saw cut). Does the ID you refer to matter? No different than a .22lr kit shooting through an AR right?

I think I'm the confused one here

I'm wanting to make a .22lr gun out of this barrel section and some other crap in the parts drawers....maybe a single shot, break action. Not sure though.
It will work and will most likely be accurate enough for general plinking.
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Old 01-13-2010, 10:10 AM   #9 (permalink)
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Quote:
Originally Posted by LiLBucket View Post
It's a "demilled" or whatever Colt M16A1 barrel (Saw cut). Does the ID you refer to matter? No different than a .22lr kit shooting through an AR right?
the 22lr conversions work although they definatly are not right. i wouldn't spend any time or money trying to turn a 22 cal centerfire barrel into a 22 cal rimfire. a .22 rimfire barrel is .222" and a .22 centerfire barrel is .224". the twist on a centerfire barrel is also much faster than a rimfire barrel. i think a typical 22lr barrel is a 16 twist. your barrel stub is probably a 7 or 9 twist (i think the a1 had a 9 twist and then a 7 twist for the a2 but i could be wrong).

basically, it could work but it definatly is not the best way to go about it.


edit: sounds like the a1's had a 12 twist barrel, not a 9.

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Old 01-13-2010, 10:19 AM   #10 (permalink)
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Quote:
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It will work and will most likely be accurate enough for general plinking.
This is the objective

Quote:
Originally Posted by 300sniper View Post
the 22lr conversions work although they definatly are not right. i wouldn't spend any time or money trying to turn a 22 cal centerfire barrel into a 22 cal rimfire. a .22 rimfire barrel is .222" and a .22 centerfire barrel is .224". the twist on a centerfire barrel is also much faster than a rimfire barrel. i think a typical 22lr barrel is a 16 twist. your barrel stub is probably a 7 or 9 twist (i think the a1 had a 9 twist and then a 7 twist for the a2 but i could be wrong).

basically, it could work but it definatly is not the best way to go about it.


edit: sounds like the a1's had a 12 twist barrel, not a 9.

Good info indeed, thank you!

I'm just looking to cobble together something out of parts on hand though. Just a project sort of thing, just because, no reason. I definitely want to stay safe/legal too though which is why this question comes up.

EDIT: based on most of the stuff you guys post that you build/machine, this is gonna be a "turd"...just a noisemaker...
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Old 01-13-2010, 10:35 AM   #11 (permalink)
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Quote:
Originally Posted by LiLBucket View Post
ya...why?


Well, it's better than a handheld cordless. See if you can bribe a local machine shop employee to turn it for you, shouldn't cost more than $10 in
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Old 01-13-2010, 10:47 AM   #12 (permalink)
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Well, it's better than a handheld cordless. See if you can bribe a local machine shop employee to turn it for you, shouldn't cost more than $10 in
...and a step up from the Dremel

Ya, I think I can get it turned locally, but I still need the dims!!!!!!!!!




...and a "joke" about the dremel....man I shouldn't even admit this....

...I took the dremel with the carbide bit on it to the inside a while back to make a .22lr ratshot cartridge fit w/the intentions of making a snake-gun for the lake. Something not very loud or high powered for if a snake is near the dock/swimming area this summer. Never finished the build though, but I tested it with a pair of vise-grips holding the barrel and a hammer.........it worked....

So, needless to say, I'll have to turn/cut a little off before boring anyhow...
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Old 01-13-2010, 11:20 AM   #13 (permalink)
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I firmly believe some people should not be allowed to own welders or dremels.
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Old 01-13-2010, 11:30 AM   #14 (permalink)
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Quote:
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I firmly believe some people should not be allowed to own welders or dremels.




It was VERY low powered shotshell....I wouldn't risk anything else...

I did built this with said dremel/welder!!.....seriously...bent the flat by scoring it along the bend line with the dremel, then welded the bend on the inside after bending "by hand".....well over 2000 rounds through it w/out a problem....(also did a Romy this way!)
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So back off muh Dremel skills!!!!

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Old 01-13-2010, 02:54 PM   #15 (permalink)
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how long a piece of bbl you want?

I have an 8" piece I cut off the free gun mossy 22rimfire...even has a front site dovetail in it.




better?
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Old 01-13-2010, 02:56 PM   #16 (permalink)
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how long a piece of bbl you want?

I have an 8' piece I cut off the free gun mossy 22rimfire...even has a front site dovetail in it.
damn, that's a long barrel!
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Old 01-13-2010, 03:21 PM   #17 (permalink)
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.22 WMR uses a centerfire diameter bullet. It also uses a slightly faster twist (1-14") than .22lr (1-16") so you'd be a little closer there, too.
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Old 01-13-2010, 05:29 PM   #18 (permalink)
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He has a barrel remnant that he wants to chamber.
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Old 01-13-2010, 05:35 PM   #19 (permalink)
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the 22lr conversions work although they definatly are not right. i wouldn't spend any time or money trying to turn a 22 cal centerfire barrel into a 22 cal rimfire. a .22 rimfire barrel is .222" and a .22 centerfire barrel is .224". the twist on a centerfire barrel is also much faster than a rimfire barrel. i think a typical 22lr barrel is a 16 twist. your barrel stub is probably a 7 or 9 twist (i think the a1 had a 9 twist and then a 7 twist for the a2 but i could be wrong).

basically, it could work but it definatly is not the best way to go about it.


edit: sounds like the a1's had a 12 twist barrel, not a 9.
Might be good for the Aguila SSS bullets.
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Old 01-14-2010, 05:26 AM   #20 (permalink)
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He has a barrel remnant that he wants to chamber.
This

So, the chamber dims?? Gonna make me register on rimfirecentral? (if i'm not already )
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Old 01-14-2010, 05:36 AM   #21 (permalink)
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As mentioned the .22 WMR is .224" in diameter as is the .223 Rem/5.56 NATO round. Might want to look into that and rent a reamer.
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Old 01-14-2010, 06:45 AM   #22 (permalink)
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Google fu shows this

.22LR Chamber Dimensions

Type______Length__Mouth Dia._Throat Dia.
Sporting____0.8751"____0.2307"____0.2270"
Bentz______0.6900"____0.2270"____0.2255"
Match _____0.6876"____0.2267"____0.2248"
Win 52-D___0.5800"____0.2278"____0.2248"

The "Ruger" 10/22 factory chamber is the "Sporting" chamber above.
The "Bentz" chamber is the 'match' chamber for semi-autos.
The "Match" chamber is for bolt actions.
The "Win M52-D" is a bolt action target rifle.
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Since you're going to need at least the finish reamer, why not buy that and measure it?
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Old 01-14-2010, 06:45 AM   #23 (permalink)
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This

So, the chamber dims?? Gonna make me register on rimfirecentral? (if i'm not already )
http://lmgtfy.com/?q=22lr+chamber+dimensions

3rd link down.
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Old 01-14-2010, 06:46 AM   #24 (permalink)
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Google fu shows this

.22LR Chamber Dimensions

Type______Length__Mouth Dia._Throat Dia.
Sporting____0.8751"____0.2307"____0.2270"
Bentz______0.6900"____0.2270"____0.2255"
Match _____0.6876"____0.2267"____0.2248"
Win 52-D___0.5800"____0.2278"____0.2248"

The "Ruger" 10/22 factory chamber is the "Sporting" chamber above.
The "Bentz" chamber is the 'match' chamber for semi-autos.
The "Match" chamber is for bolt actions.
The "Win M52-D" is a bolt action target rifle.
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Since you're going to need at least the finish reamer, why not buy that and measure it?
Damn you beat me by mere seconds.
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Old 01-14-2010, 07:20 AM   #25 (permalink)
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Quote:
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Google fu shows this

.22LR Chamber Dimensions

Type______Length__Mouth Dia._Throat Dia.
Sporting____0.8751"____0.2307"____0.2270"
Bentz______0.6900"____0.2270"____0.2255"
Match _____0.6876"____0.2267"____0.2248"
Win 52-D___0.5800"____0.2278"____0.2248"

The "Ruger" 10/22 factory chamber is the "Sporting" chamber above.
The "Bentz" chamber is the 'match' chamber for semi-autos.
The "Match" chamber is for bolt actions.
The "Win M52-D" is a bolt action target rifle.
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Since you're going to need at least the finish reamer, why not buy that and measure it?

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I had seen that link and honestly forgot I saw it.....sorry...thanks though

So, what size do dremel carbide bits come in
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