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Mauser conversion headquarters
Kits to be back in stock July 2017

45acp, 450 Bushmaster,  and  7.62*39  mauser conversions
Customer Pictures of stocks and kits How to Videos

Special notes on Spanish 1916 Mausers

The Spanish Mausers hitting the market now are from the Samco Global auction. They are very rough but can make for a good conversion for the low pressure 45acp. We do not recomend any other caliber conversion for these as they are of unknown heat treat. To get them to work with the 45acp, the bolt will need to be slightly modified on the bottom, which will destory the case hardening on the bolt head. We will upload pictures soon, on what is addinitally needed for the bolt. It appears to be a pretty easy conversion.

Available Mauser kits 8/15/15
Spare Ejectors
We are working on a next generation ejector with revised shape and material. Should be ready by late Feb 2017. We are currently selling the original design as  a spare in the mean time.

Mauser ejector

The Mauser 45acp kits,
in stock

The 45acp kits feature a military profile barrel that is 16.5" long and uses our quick barrel change system were no gunsmithing needed. These kits are available for both the large ring and small ring Mauser actions.  The kits include a barrel, barrel lock nut, ejector and mag adapter. You need to supply the Colt magazine and  magazine catch which is just a Colt 1911 extended type.

Mauser 45acp kit support---If you are having difficulty getting the barrel threads to fit your rifle, you can send your action and barrel in for us to fit it, this will generally be more of a problem with the small ring threads but will gladly do it on any of the threads. Its best to fit the threads before you put a finish on them. We use Brownells tap/die sets to match up the threads. Please email for mailing info and turnaround time. Turn around time should be around 10-12 days. This is free service we offer.

These work with Mauser K98, Czech Vz22-Vz24 and Turkish Mausers the best. DO NOT USE YUGOSLAVIAN M48 rifles, it is very difficult to get them to work correctly due to the bolt face and feed ramp designs.

NOTE-all military barrels now feature threaded muzzles.

Mauser 45acp kits
 Military barrels with threaded muzzels
Threads are .578"-28

Twist rate on all barrels 1-16

  Small ring kits back in stock-10/5/16

Coming soon

450 Bushmaster barrels
coming March 2017-estimated price $125.00
These barrels will be made of 4150 carbon steel, feature a 1-16 twist for heavy bullets and come different profiles. We expect a straight taper with threaded crown around 17" long and a bull barrel possibly around 18" long.  Threads for suppressors will be 3/4-24.
   Mauser next generation rifle stock
Coming April/May 2017

This stock will be a cross between our EXO and the Leopard stocks. Designed for the long action and capable of using single stack magazines.

Mauser with the 7.62*39 kits

Mauser 7.62*39 kits

Large and small ring kits now in stock 1/15/16

The 7.62*39 conversion kit
by Rhineland Arms is the most advanced kit available for the conversion of Mausers to this caliber. We feature a fully chambed barrel with lock ring and a mag adapter for use with Cz 527 magazines which greatly helps with feeding and simplicity in the conversion(adapter is held in by a single 1/8" pin).

Please note the Mauser bolt face is a bit too large for this caliber. The use of a oversize extractor and bolt face modifications will allow for perfect exraction and ejection as well. We are working on a easy conversion kit for that.

Mauser 7.62*39 kits
Mauser 7.62 * 39 barrels
Bore Specs=1:9.5 twist and a .3005-.302
bore/.3105-.312 groove
Muzzle threaded barrels are 5/8-24

 The 7.62* 39 conversion  barrels are finally available with and without threads for suppressors. Please note these barrels use our barrel nut system so no chambering is required and the surface is left with a slight texture. All barrels are fully chambered, 16.5" long and true bore for 7.62*39 and use our locking ring.





Mauser 7.62*39 barrels
Mauser magazine adapters for 7.62*39 and 6.5 Grendel
This is the new magazine adapter for large and small ring mausers. These are designed to be used with the Cz527 magazines and feature a single colum feed for more reliablilty.

Mauser 7.62*39 installation instructions
mag adatper


Mauser kits in development
  Mauser commerical receivers available from Sarco, click here for $300 we have not had a chance to get one of these in and review them yet. This is a commercial receier and most likely does not have the thumb slot we use for the extended ejector. This receiver will most likely be great for custom conversions greater than 45ACP.

They also have a 1893 actions for around $80 as of Jan 2017. These are best left to 45acp only.

Mauser k98 aluminum stocks, we are no longer making or designing bare aluminum chassis for the Mauser.

We are working on a new stock for Mausers that incorporates an aluminum chassis with wood for a more interesting and useful design. This will be for release in the first or second quarter 2017.
Mauser 45magnum   conversions. The one shown uses M1 carbine mags, we are trying to get away from that for a much simplified conversion. It should work with multiple pistol calibers when we are done. Opening the door to many more calibers for the Mauser.
 Other Mauser conversions  
We are working with some newer cartridges for the Mauser that bring a lot of diversity to the platform. 450 Bushmaster is on our radar and we might make barrels for it in 2017.

   Mauser Updates

Mauser barrels in 450 Bushmaster-Legal for hunting in Indiana and Michigan-in the works

Mauser 45acp Youtube How-To videos

 old instructions on Mauser conversions  Mauser 45acp

About Us Products Misc Rhineland Arms, Made in USA   Mailing address, non FFL items only  
Manufacturing Mauser Aquafortis-refinishing   Rhineland  
Contact Info Leopard       PMB #150  
Old Instructions Scorpion       15814 Champion forrest  
AR57 History PSL-54c       Spring, Texas, 77379-7141