Hi TrelosGreek
Most Mausers use a bar vs. a bayonet lug. The bar extends through the handle providing the stability. Lug mounted bayonets are only fastened at the rear of the hilt, and therefore, require the muzzle ring for front support.

 

The Germans found that a muzzle ring affected accuracy, and since most Mauser rifles came out of the Mauser factory rather than FN or domestic production, the vast majority had the new-model-year features. Some countries who'd bought earlier patterns or had their own ideas didn't agree, since the ring is supposedly sturdier.

 

Germany was the biggest user of the ring-less bayonets. The development of the long lug for fixing the bayonet was developed by Germany with the adoption of the Gew98 and extended to the Kar98, Kar98a, Kar98b and Kar98k. Since the ring on the bayonet was considered detrimental to accuracy when the bayonet was fixed, all German bayonets from the long Sg98 through the Sg84/98III (1898 - 1945) were made without rings. Most other nations, even those using a long lug bayonet mount (example: Czechoslovakia and Poland) continued using the ring since it was felt that it made the bayonet more secure in use.

 

Well, there you go , I knew there must have been a real good reason. Thank you for shedding light to a question that has plaqued me for a long time.