I'm still not sure what model it is or if I can shoot GP11 in it. If anyone knows, please help me ID it. Serial number is 24999X.

It's a 1911, it is the model before the K-31, and yes it uses GP-11....

That looks like a 1911 to me. GP11 ammo is fine for it.

Quoted: It's a 1911, it is the model before the K-31, and yes it uses GP-11....

No no, thats a Swiss 2355. Pretty much a piece of junk. Its uses some very obscure hard to get caliber, like 6.5x48 or some such. About the only solution these days is to cut your own brass down for it.
Really not worth anything more then a paperweight.

If you dont need it, I suppose I could take it off your hands for 50 bucks or so, seeing as its not much use to anyone unless they need a paperweight..........

I'll even cover shipping.

Looks like a 1911 Carbine to me.  

Did you look here?

Quoted: Looks like a 1911 Carbine to me.   Did you look here?

Thanks...I just looked. So it appears the serial number of my rifle means it was originally a 89/96 manufactured in 1899. The 89/96 rifles CANNOT fire the higher pressure GP11. Then it appears the Swiss upgraded these 89/96 rifles to the 1911 configuration and the new name for the modified rifles is the 96/11. I think this is what my rifle is (a 96/11). The part that confuses me is I can't find a clear statement that says "89/96 rifles that were upgraded to 96/11 rifles can fire the GP11 round".

It looks very nice, and certainly worth the bucks you shed.

-White Horse

Barrel Length - 30.7 inches: 3-groove, RH, concentric rifling, 1 in 10.63
Overall Length - 51.2 inches
Weight - 9.92lbs empty
Action - Schmidt-Rubin Straight Pull
Caliber - 7.5x53.5 Swiss (GP90 & GP 90/03)
             7.5x54.5 Swiss (GP90/23)  
Capacity - 12 round detachable box magazine
Sights - Quadrant sight graduated to 2000m
Total Production : 137,050
Bayonet: Model 1889, Model 1899, Model 1889/92, and Model 1906

Even before the Model 1889 entered service, the Swiss Rifle Technical Commission had reservations about the strength of the Model 1889s action.  In 1888 they requested Col. Schmidt to redesign the Model 1889 action by moving the locking lugs forward on the bolt sleeve.  However, Colonel Rudolph Schmidt, then the Director of Armament Manufacturing, refuse the request, claiming such a change was “not feasible.”

As the Model 1889 entered service, the Rifle Commissions fears were realized, yy 1892, it became apparent the rear mounted locking lugs of the Model 1889 were problematic.  On November 3, 1892, Col. Vogelsang was assigned the task of designing three rifles with improved actions, shortly thereafter, and addition 50 rifles were requested

Col. Vogelsang’s, along with the assistance of his co-worker Rebholz, changes were fairly simple.  In essence, here merely moved the locking lugs from the rear of the bolt sleeve to the front of the bolt sleeve.  These changes weren’t quite that simple however, as it required a redesign of the bolt (including the bolt sleeve, firing pin and firing pin spring), receiver, and the stock.    

Due to turnover amongst Armament Manufacturer Department Heads testing of the new action was delayed until 1895.  On 1 January 1895, the test rifles were delivered to the shooting school in Walenstadt.  Testing of the new design numerous improvements in performance.  

Testing determined –
The bolt itself was strengthened,
Breakage of the locking lugs was reduced,
The action could handle higher pressure cartridges,
There was less binding of the bolt,
There was tighter lock-up of the bolt, producing better accuracy,
There was an increase in the length of pull, by 2cm, allowing for a better shooting position,
And there was a decrease in weight of about 100g,

It was determined that it would be impractical to attempt to convert the existing Model 1889s to the new action type, thus a new rifle model was required.  Thus on July 31, 1896, a new rifle, designated the Model 1889/96 was approved for service.

Several minor modifications to the design were made throughout the service life of the rifle.  Even before the rifle entered into production the barrel band and firing pin spring was redesigned and the rear of the receiver was widened slightly.  Shortly thereafter, the firing pin itself was widened from 3.5 to mm in diameter.  

Nearly all of the 1889/96 were converted into Model 1896/11 in the 1910s.  Of the 137,000 89/96s produced, only 1,280 remained in their original configuration.