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  • 1 Post By gundoc

Thread: Relining C96 Mauser pistols

  1. #1
    Member C96guy's Avatar
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    Relining C96 Mauser pistols

    Does anyone in NZ (or "nearby") reline C96 Broomhandle Mauser pistol barrels to restore the bores of guns that have suffered the plight of improper cleaning after shooting corrosive ammo?
    The Glock pistol: Sort of like playing Mozart on the harmonica

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    It is a technically pretty straight-forward job. Cut off the barrel at the step, face, bore and thread the receiver, machine and fit the new barrel and refit the front sight, headspace and reblue. The hardest part is finding .30 calibre barrel with the required 14" twist. Some .308 ex target rifle barrels are sneaking towards that (13") and would do at a pinch. The down side is that it would be an expensive (probably $800 - $1,000) job that would require the services of a specialist gunsmith, and would also spoil any collector value the pistol has. Even in good condition they are only mediocre shooters, more a fun thing than serious 'classic pistol' shooting.

  3. #3
    Member C96guy's Avatar
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    Actually you are talking about rebarreling. Relining is more intricate and involves boring out the barrel (not cutting it off), and installing a liner in ether 7.63x25 or even 9mm (which is even tricker). The gun shoots like new and the appearance is uneffected. Also, the correct twist is 6 grooves 1:10, not 1:14.

    As an aside, often C96s are encountered with chambers that are way worse than the bore! Specifically, chambers will be oversized to the point where headspacing is a disaster and cases split in weird ways on first firing (for example, developing splits at the shoulder or even down the length). Broomhandles ended up that way because lots of owners knew that they had to clean the gun - but didn't know how to disassemble the upper, to clean from the breach (or were too lazy to do so). As such, people would often "clean" the gun by pushing a cleaning patch in from the bore - which of course just pushes all the corrosive salts into the chamber.
    The Glock pistol: Sort of like playing Mozart on the harmonica

  4. #4
    Member zimmer's Avatar
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    Sounds like u have it all in hand mate and didn't need gundocs advise...

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    Strangely enough I am well aware of the difference between relining and rebarreling, however the system I suggested is actually a bit of both, and is the system practiced in the US when they imported a whole swag years ago out of China with poor barrels. Relining is entirely satisfactory but is slightly more difficult to acheive good results, and consequently even more cost. I know that the C96 twist rate is not 14" but is actually 13.8" or one turn in 350mm which is why I suggested a 13" twist ex-target barrel would be OK, but I guess your 10" twist would allow the bullets to go 25 metres with moderately adequate accuracy. Of course 9mm Parabellum would be much easier to feed but the C96 barrel would be paper thin for a 9mm reline. It would probably make more sense to sell your C96 to a collector and spend a bit more to buy a good example at auction. I would have offered to do the job for you but I am going to be too busy for next year or so.
    P38 likes this.

  6. #6
    Member C96guy's Avatar
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    The factory twist for a C96 "Broomhandle" Mauser pistol is 1:7.87 as shown on page 30 of the English language version of the owners manual for the 1930 model - as reproduced on page 255 of System Mauser.

    Name:  C96 twist.JPG
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    Since 1:8 or so barrels have been hard to come by until recently, most people who have relined these guns have gone with 1:10 barrel liners with no ill effects. A 1:10 liner will stabilize the heaviest bullet one is likely to want to push down the barrel of a C96 (typically no more than 110 grains), but I don't think 1:13 or 1:14 would do the job. I certainly don't know why one would go to extra trouble to try to locate a barrel (or liner) with such a slow pitch - rather counterproductive.
    Last edited by C96guy; 18-02-2017 at 05:56 PM.
    The Glock pistol: Sort of like playing Mozart on the harmonica

  7. #7
    Member 300CALMAN's Avatar
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    Why don't you purchase an AR15 300AAC/Blackout barrel in 1:8 twist and use that to make the liner or new barrel? They are available from about $400 and the same caliber.

  8. #8
    Member C96guy's Avatar
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    Quote Originally Posted by 300CALMAN View Post
    Why don't you purchase an AR15 300AAC/Blackout barrel in 1:8 twist and use that to make the liner or new barrel? They are available from about $400 and the same caliber.
    Yes that is what I mentioned 1:8 barrels use to be hard to get but no longer. If one cares to do so, a 1:8 barrel can now be obtained and turned down as a liner. However 1:10 take-offs can be bought for around $80 and do just as well. I'd steer clear of 1:14 or so, for the reasons noted.

    Also, in the interests of completeness I'd note that 9mm cartridge does not feed more easily in the C96, but rather, 9mm C96s are less reliable than their 7.63x25 counterparts (whether factory 9mms or relines).

    Relining to 9mm is tricky but not impossible. The Chinese perfected the method on those nasty Navy Arms-type TU711 guns - with no issues.

    "The Broom Closet" (A.K.A. Florida Gun Works) did many relines in 9mm - but they did very poor work and are now out of business.

    Redmans, in the US used to rebore to 9mm but - by definition - they never addressed the oversized chamber problem (associated with using the remains of the rotted-out 7.63x25 chamber as a pseudo 9x19 chamber). They don't do that work anymore but - even when they did, they required their customers to sign as disclaimer. I was such a customer. They told me that the work probably wouldn't work out well and, indeed, it didn't.

    That was a couple of decades ago, in those happy days before ITAR. I am slightly wiser now (I think)
    The Glock pistol: Sort of like playing Mozart on the harmonica

  9. #9
    Member 300CALMAN's Avatar
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    BTW welcome to the forum C96guy

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    Member C96guy's Avatar
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    Thanks.

    Sounds like you are a 300 Blackout fan. I am too. The World is a better place since it was developed. I load them with trailboss and heavy cast projectiles which I tumble powder coat. They shoot brilliantly subsonic.
    The Glock pistol: Sort of like playing Mozart on the harmonica

  11. #11
    Member 300CALMAN's Avatar
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    Quote Originally Posted by C96guy View Post
    Thanks.

    Sounds like you are a 300 Blackout fan. I am too. The World is a better place since it was developed. I load them with trailboss and heavy cast projectiles which I tumble powder coat. They shoot brilliantly subsonic.
    Yes definitely,

    I am shooting everything with Lil'gun at the moment. Supersonic 144 grain ADI projectiles for plinking/service rifle and 125 grain Speer for hunting. Subsonic 190 lee cast and 240 grain SMKs (while I have them).

    You will find a number of 300 fans here.

 

 

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